diff --git a/src/QueryDetector.php b/src/QueryDetector.php
index 0d3dcc6..8deb29a 100755
--- a/src/QueryDetector.php
+++ b/src/QueryDetector.php
@@ -74,6 +74,10 @@ public function logQuery($query, Collection $backtrace)
                 }
 
                 $sources = $this->findSource($backtrace);
+                
+                if (empty($sources)) {
+                    return;
+                }
 
                 $key = md5($query->sql . $model . $relationName . $sources[0]->name . $sources[0]->line);