diff --git a/octoprint_DisplayLayerProgress/__init__.py b/octoprint_DisplayLayerProgress/__init__.py
index 8ef0d24..c37f204 100644
--- a/octoprint_DisplayLayerProgress/__init__.py
+++ b/octoprint_DisplayLayerProgress/__init__.py
@@ -29,8 +29,8 @@
 LAYER_EXPRESSION_CURA = ";LAYER:([0-9]+).*"
 LAYER_EXPRESSION_S3D = "; layer ([0-9]+),.*"
 LAYER_COUNT_EXPRESSION = LAYER_MESSAGE_PREFIX + "([0-9]*)"
-# Match G1 Z149.370 F1000 or G0 F9000 X161.554 Y118.520 Z14.950
-Z_HEIGHT_EXPRESSION = "(.*)( Z)([+]*[0-9]+.[0-9]*)(.*)"
+# Match G1 Z149.370 F1000 or G0 F9000 X161.554 Y118.520 Z14.950     ##no comments
+Z_HEIGHT_EXPRESSION = "^[^;](.*)( Z)([+]*[0-9]+[.]*[0-9]*)(.*)"
 zHeightPattern = re.compile(Z_HEIGHT_EXPRESSION)
 # Match G0 or G1 positive extrusion e.g. G1 X58.030 Y72.281 E0.1839 F2250
 EXTRUSION_EXPRESSION = "G[0|1] .*E[+]*([0-9]+[.]*[0-9]*).*"
@@ -155,23 +155,31 @@ def on_event(self, event, payload):
             totalHeight = 0.0
             currentHeight = 0.0
             lineNumber = 0
+            self._activateBusyIndicator()
             with open(selectedFile, "r") as f:
                 for line in f:
-                    lineNumber += 1
-                    matched = pattern.match(line)
-                    if matched:
-                        layerOffset = self._settings.get_int([SETTINGS_KEY_LAYER_OFFSET])
-                        self._layerTotalCount = str(int(matched.group(1)) + layerOffset)
-
-                    matched = zHeightPattern.match(line)
-                    if matched:
-                        currentHeight = float(matched.group(3))
-                        if currentHeight > totalHeight:
-                            totalHeight = currentHeight
-
-                    matched = extrusionPattern.match(line)
-                    if matched:
-                        self._totalHeightWithExtrusion = currentHeight
+                    try:
+                        lineNumber += 1
+                        matched = pattern.match(line)
+                        if matched:
+                            layerOffset = self._settings.get_int([SETTINGS_KEY_LAYER_OFFSET])
+                            self._layerTotalCount = str(int(matched.group(1)) + layerOffset)
+
+                        matched = zHeightPattern.match(line)
+                        if matched:
+                            currentHeight = float(matched.group(3))
+                            if currentHeight > totalHeight:
+                                totalHeight = currentHeight
+
+                        matched = extrusionPattern.match(line)
+                        if matched:
+                            self._totalHeightWithExtrusion = currentHeight
+                    except (ValueError, RuntimeError):
+                        print("BOOOOOOMMMM")
+                        print("#"+lineNumber + " "+line)
+
+
+
             if self._settings.get([SETTINGS_KEY_TOTAL_HEIGHT_METHODE]) == HEIGHT_METHODE_Z_MAX:
                 self._totalHeight = "%.2f" % totalHeight
             else:
@@ -209,6 +217,10 @@ def _resetProgressValues(self):
         self._totalHeight = 0.0
         self._totalHeightWithExtrusion = 0.0
 
+    def _activateBusyIndicator(self):
+        self._plugin_manager.send_plugin_message(self._identifier, dict(busy=True))
+
+
     def _updateDisplay(self, updateReason):
         currentValueDict = {
             PROGRESS_KEYWORD_EXPRESSION: self._progress,
diff --git a/octoprint_DisplayLayerProgress/static/js/DisplayLayerProgress.js b/octoprint_DisplayLayerProgress/static/js/DisplayLayerProgress.js
index 65de7e6..2e74b7b 100644
--- a/octoprint_DisplayLayerProgress/static/js/DisplayLayerProgress.js
+++ b/octoprint_DisplayLayerProgress/static/js/DisplayLayerProgress.js
@@ -33,15 +33,18 @@ $(function () {
             var element = $("#state").find(".accordion-inner .progress");
             if (element.length) {
 
+
+                var busyIndicator = "<i class='fa fa-spinner fa-spin busyIndicator' style='display:none'></i>";
+
                 var label = gettext("Current Height");
                 var tooltip = gettext("Might be inaccurate!");
                 element.before("<span title='" + tooltip + "'>" + label + "</span>" + ": "
-                    + "<strong id='state_height_message'>- / -</strong><br>");
+                    + "<strong id='state_height_message'>- / -</strong>"+busyIndicator+"  <br>");
 
                 label = gettext("Layer");
                 tooltip = gettext("Shows the layer information");
                 element.before("<span title='" + tooltip + "'>" + label + "</span>" + ": "
-                    + "<strong id='state_layer_message'>- / -</strong><br>");
+                    + "<strong id='state_layer_message'>- / -</strong>"+busyIndicator+"<br>");
 
                 // call backend for update navbar and printer-display
                 OctoPrint.get("api/plugin/"+PLUGIN_ID);
@@ -56,6 +59,12 @@ $(function () {
                 return;
             }
 
+            if (data.busy){
+                $(".busyIndicator").show();
+            } else {
+                $(".busyIndicator").hide();
+            }
+
             // NavBar
             if (data.navBarMessage){
                 self.navBarMessage(data.navBarMessage);
diff --git a/setup.py b/setup.py
index d826b7f..7e15898 100644
--- a/setup.py
+++ b/setup.py
@@ -14,7 +14,7 @@
 plugin_name = "DisplayLayerProgress"
 
 # The plugin's version. Can be overwritten within OctoPrint's internal data via __plugin_version__ in the plugin module
-plugin_version = "1.5.0"
+plugin_version = "1.5.1"
 
 # The plugin's description. Can be overwritten within OctoPrint's internal data via __plugin_description__ in the plugin
 # module