throw error exceptions on error levels only

Modules/Core/ShopControl_DebugBar.php

@@ -43,10 +43,11 @@ class ShopControl_DebugBar extends ShopControl_DebugBar_parent
     public function d3DebugBarSetErrorHandler()
     {
         if ($this->d3CanActivateDebugBar()) {
-            set_error_handler( function( $severity, $message, $file, $line ) {
-                if ( ! ( error_reporting() & $severity ) ) {
+            set_error_handler(
+                function( $severity, $message, $file, $line ) {
+                    if ( 0 === error_reporting() || !( error_reporting() & $severity ) ) {
                         // This error code is not included in error_reporting.
-                    return;
+                        return false;
                     }
 
                     $smartyTemplate = $this->getSmartyTemplateLocationFromError( $message );
@@ -55,7 +56,9 @@ class ShopControl_DebugBar extends ShopControl_DebugBar_parent
                     }
 
                     throw new ErrorException( $message, 0, $severity, $file, $line );
-            } );
+                },
+                E_ERROR | E_CORE_ERROR | E_COMPILE_ERROR | E_USER_ERROR | E_RECOVERABLE_ERROR
+            );
         }
     }