diff --git a/lib/jpgraph/src/gd_image.inc.php b/lib/jpgraph/src/gd_image.inc.php
index d13ce28..97368d4 100755
--- a/lib/jpgraph/src/gd_image.inc.php
+++ b/lib/jpgraph/src/gd_image.inc.php
@@ -11,6 +11,7 @@
 require_once 'jpgraph_rgb.inc.php';
 require_once 'jpgraph_ttf.inc.php';
 require_once 'imageSmoothArc.php';
+require_once 'jpgraph_errhandler.inc.php';
 
 // Line styles
 define('LINESTYLE_SOLID',1);
diff --git a/lib/jpgraph/src/jpgraph.php b/lib/jpgraph/src/jpgraph.php
index 5db0bbc..db3ce82 100755
--- a/lib/jpgraph/src/jpgraph.php
+++ b/lib/jpgraph/src/jpgraph.php
@@ -19,7 +19,7 @@
 require_once('gd_image.inc.php');
 
 // Version info
-define('JPG_VERSION','4.0.2');
+define('JPG_VERSION','4.2.0');
 
 // Minimum required PHP version
 define('MIN_PHPVERSION','5.1.0');
@@ -1492,7 +1492,7 @@ function GetTextsYMinMax($aY2=false) {
         else {
             $txts = $this->texts;
         }
-        $n = count($txts);
+        $n = is_array($txts) ? count($txts) : 0;
         $min=null;
         $max=null;
         for( $i=0; $i < $n; ++$i ) {
@@ -1521,7 +1521,7 @@ function GetTextsXMinMax($aY2=false) {
         else {
             $txts = $this->texts;
         }
-        $n = count($txts);
+        $n = is_array($txts) ? count($txts) : 0;
         $min=null;
         $max=null;
         for( $i=0; $i < $n; ++$i ) {
@@ -3021,7 +3021,7 @@ function SetTextScaleAbsCenterOff($aOff) {
 
     // Get Y min and max values for added lines
     function GetLinesYMinMax( $aLines ) {
-        $n = count($aLines);
+        $n = is_array($aLines) ? count($aLines) : 0;
         if( $n == 0 ) return false;
         $min = $aLines[0]->scaleposition ;
         $max = $min ;
@@ -3039,7 +3039,7 @@ function GetLinesYMinMax( $aLines ) {
 
     // Get X min and max values for added lines
     function GetLinesXMinMax( $aLines ) {
-        $n = count($aLines);
+        $n = is_array($aLines) ? count($aLines) : 0;
         if( $n == 0 ) return false ;
         $min = $aLines[0]->scaleposition ;
         $max = $min ;
@@ -3588,7 +3588,7 @@ function DoStroke($aTicksPos,$aType,$aColor,$aWeight) {
 
             if( $this->fill ) {
                 // Draw filled areas
-                $y2 = $aTicksPos[0];
+                $y2 = !empty($aTicksPos) ? $aTicksPos[0] : null;
                 $i=1;
                 while( $i < $nbrgrids ) {
                     $y1 = $y2;
@@ -4335,14 +4335,14 @@ function SetTickPositions($aMajPos,$aMinPos=NULL,$aLabels=NULL) {
     }
 
     function HaveManualLabels() {
-        return count($this->iManualTickLabels) > 0;
+        return is_array($this->iManualTickLabels) ? count($this->iManualTickLabels) > 0 : false;
     }
 
     // Specify all the tick positions manually and possible also the exact labels
     function _doManualTickPos($aScale) {
         $n=count($this->iManualTickPos);
-        $m=count($this->iManualMinTickPos);
-        $doLbl=count($this->iManualTickLabels) > 0;
+        $m= is_array($this->iManualMinTickPos) ? count($this->iManualMinTickPos) : 0;
+        $doLbl= is_array($this->iManualTickLabels) ? count($this->iManualTickLabels) > 0 : false;
 
         $this->maj_ticks_pos = array();
         $this->maj_ticklabels_pos = array();
diff --git a/lib/jpgraph/src/jpgraph_bar.php b/lib/jpgraph/src/jpgraph_bar.php
index cedc183..ed1d367 100755
--- a/lib/jpgraph/src/jpgraph_bar.php
+++ b/lib/jpgraph/src/jpgraph_bar.php
@@ -681,7 +681,7 @@ class GroupBarPlot extends BarPlot {
     private $nbrplots=0;
     //---------------
     // CONSTRUCTOR
-    function GroupBarPlot($plots) {
+    function __construct($plots) {
         $this->width=0.7;
         $this->plots = $plots;
         $this->nbrplots = count($plots);
diff --git a/lib/jpgraph/src/jpgraph_flags.php b/lib/jpgraph/src/jpgraph_flags.php
index a7e2187..f062eb6 100755
--- a/lib/jpgraph/src/jpgraph_flags.php
+++ b/lib/jpgraph/src/jpgraph_flags.php
@@ -267,7 +267,7 @@ class FlagImages {
     private $iFlagData ;
     private $iOrdIdx=array();
 
-    function FlagImages($aSize=FLAGSIZE1) {
+    function __construct($aSize=FLAGSIZE1) {
         switch($aSize) {
             case FLAGSIZE1 :
             case FLAGSIZE2 :
@@ -309,10 +309,9 @@ function GetIdxByOrdinal($aOrd,&$outFullName) {
         $aOrd--;
         $n = count($this->iOrdIdx);
         if( $n == 0 ) {
-            reset($this->iCountryNameMap);
             $this->iOrdIdx=array();
             $i=0;
-            while( list($key,$val) = each($this->iCountryNameMap) ) {
+            foreach( $this->iCountryNameMap as $key => $val ) {
                 $this->iOrdIdx[$i++] = array($val,$key);
             }
             $tmp=$this->iOrdIdx[$aOrd];
@@ -341,18 +340,16 @@ function GetIdxByName($aName,&$outFullName) {
         $found=false;
         $aName = strtolower($aName);
         $nlen = strlen($aName);
-        reset($this->iCountryNameMap);
         // Start by trying to match exact index name
-        while( list($key,$val) = each($this->iCountryNameMap) ) {
+        foreach( $this->iCountryNameMap as $key => $val ) {
             if( $nlen == strlen($val) && $val == $aName )  {
                 $found=true;
                 break;
             }
         }
         if( !$found ) {
-            reset($this->iCountryNameMap);
             // If the exact index doesn't work try a (partial) full name
-            while( list($key,$val) = each($this->iCountryNameMap) ) {
+            foreach( $this->iCountryNameMap as $key => $val ) {
                 if( strpos(strtolower($key), $aName) !== false ) {
                     $found=true;
                     break;
diff --git a/lib/jpgraph/src/jpgraph_gradient.php b/lib/jpgraph/src/jpgraph_gradient.php
index 225cf60..e3c24d3 100755
--- a/lib/jpgraph/src/jpgraph_gradient.php
+++ b/lib/jpgraph/src/jpgraph_gradient.php
@@ -410,8 +410,8 @@ function GetColArray($from_color,$to_color,$arr_size,&$colors,$numcols=100) {
         $bdelta=($to_color[2]-$from_color[2])/$numcols;
         $colorsperstep = $numcols/$arr_size;
         $prevcolnum = -1;
-        $from_alpha = $from_color[3];
-        $to_alpha = $to_color[3];
+        $from_alpha = floatval($from_color[3]);
+        $to_alpha = floatval($to_color[3]);
         $adelta = ( $to_alpha - $from_alpha ) / $numcols ;
         for ($i=0; $i < $arr_size; ++$i) {
             $colnum = floor($colorsperstep*$i);
diff --git a/lib/jpgraph/src/jpgraph_line.php b/lib/jpgraph/src/jpgraph_line.php
index 21dd821..8175659 100755
--- a/lib/jpgraph/src/jpgraph_line.php
+++ b/lib/jpgraph/src/jpgraph_line.php
@@ -35,7 +35,7 @@ class LinePlot extends Plot{
 
     //---------------
     // CONSTRUCTOR
-    function LinePlot($datay,$datax=false) {
+    function __construct($datay,$datax=false) {
         parent::__construct($datay,$datax);
         $this->mark = new PlotMark() ;
         $this->color = ColorFactory::getColor();
diff --git a/lib/jpgraph/src/jpgraph_log.php b/lib/jpgraph/src/jpgraph_log.php
index d5146ec..2f7e4e8 100755
--- a/lib/jpgraph/src/jpgraph_log.php
+++ b/lib/jpgraph/src/jpgraph_log.php
@@ -131,7 +131,7 @@ class LogTicks extends Ticks{
     private $ticklabels_pos = array();
     //---------------
     // CONSTRUCTOR
-    function LogTicks() {
+    function __construct() {
     }
     //---------------
     // PUBLIC METHODS
diff --git a/lib/jpgraph/src/jpgraph_pie.php b/lib/jpgraph/src/jpgraph_pie.php
index c79d30f..226784a 100755
--- a/lib/jpgraph/src/jpgraph_pie.php
+++ b/lib/jpgraph/src/jpgraph_pie.php
@@ -296,14 +296,16 @@ function Legend($graph) {
 
         // Make sure we don't plot more values than data points
         // (in case the user added more legends than data points)
-        $n = min(count($this->legends),count($this->data));
+        $legendsCount = is_array($this->legends) ? count($this->legends) : 0;
+        $n = min($legendsCount,count($this->data));
         if( $this->legends != "" ) {
             $this->legends = array_reverse(array_slice($this->legends,0,$n));
         }
         for( $i=$n-1; $i >= 0; --$i ) {
             $l = $this->legends[$i];
             // Replace possible format with actual values
-            if( count($this->csimalts) > $i ) {
+            $count = is_array($this->csimalts) ? count($this->csimalts) : 0;
+            if( $count > $i ) {
                 $fmt = $this->csimalts[$i];
             }
             else {
diff --git a/lib/jpgraph/src/jpgraph_polar.php b/lib/jpgraph/src/jpgraph_polar.php
index 62c6bbc..df73828 100755
--- a/lib/jpgraph/src/jpgraph_polar.php
+++ b/lib/jpgraph/src/jpgraph_polar.php
@@ -423,6 +423,7 @@ function StrokeAngleLabels($pos,$type) {
                         $this->img->Line($x1,$y1,$x2,$y2);
                     }
                 }
+                $a = (int) $a;
                 $a += $this->angle_step;
             }
         }
@@ -487,6 +488,7 @@ function StrokeAngleLabels($pos,$type) {
                 if( $this->show_angle_tick ) {
                     $this->img->Line($x1,$y1,$x2,$y2);
                 }
+                $a = (int) $a;
                 $a += $this->angle_step;
             }
         }
diff --git a/lib/jpgraph/src/jpgraph_scatter.php b/lib/jpgraph/src/jpgraph_scatter.php
index fe987c2..7c99d39 100755
--- a/lib/jpgraph/src/jpgraph_scatter.php
+++ b/lib/jpgraph/src/jpgraph_scatter.php
@@ -136,7 +136,7 @@ class ScatterPlot extends Plot {
     //---------------
     // CONSTRUCTOR
     function __construct($datay,$datax=false) {
-        if( (count($datax) != count($datay)) && is_array($datax)) {
+        if( is_array($datax) && (count($datax) != count($datay)) ) {
         	JpGraphError::RaiseL(20003);//("Scatterplot must have equal number of X and Y points.");
         }
         parent::__construct($datay,$datax);
diff --git a/lib/jpgraph/src/jpgraph_table.php b/lib/jpgraph/src/jpgraph_table.php
index 852d78b..7f55cc1 100755
--- a/lib/jpgraph/src/jpgraph_table.php
+++ b/lib/jpgraph/src/jpgraph_table.php
@@ -141,10 +141,16 @@ function SetGridStyle($aLeft,$aTop=null,$aBottom=null,$aRight=null) {
     }
 
     function SetGridWeight($aLeft=null,$aTop=null,$aBottom=null,$aRight=null) {
-        if( $aLeft !== null ) $this->iGridWeight[0] = $aLeft;
-        if( $aTop !== null ) $this->iGridWeight[1] = $aTop;
-        if( $aBottom !== null ) $this->iGridWeight[2] = $aBottom;
-        if( $aRight !== null ) $this->iGridWeight[3] = $aRight;
+        $weight_arr = array($aLeft, $aTop, $aBottom, $aRight);
+        for ($i = 0; $i < count($weight_arr); $i++) {
+            if ($weight_arr[$i] === "") {
+                $weight_arr[$i] = 0;
+            }
+        }
+        if( $aLeft !== null ) $this->iGridWeight[0] = $weight_arr[0];
+        if( $aTop !== null ) $this->iGridWeight[1] = $weight_arr[1];
+        if( $aBottom !== null ) $this->iGridWeight[2] = $weight_arr[2];
+        if( $aRight !== null ) $this->iGridWeight[3] = $weight_arr[3];
     }
 
     function SetMargin($aLeft,$aRight,$aTop,$aBottom) {