diff --git a/src/messenger/webim/js/compiled/mibewapi.js b/src/messenger/webim/js/compiled/mibewapi.js
index 7d8ab6a5..988493e5 100644
--- a/src/messenger/webim/js/compiled/mibewapi.js
+++ b/src/messenger/webim/js/compiled/mibewapi.js
@@ -18,4 +18,4 @@ MibewAPIInteraction.prototype.getObligatoryArgumentsDefaults=function(a){var b={
 function MibewAPIExecutionContext(){this.returnValues={};this.functionsResults=[]}
 MibewAPIExecutionContext.prototype.getArgumentsList=function(a){var b=a.arguments,c=a.arguments.references,d,f,e;for(e in c)if(c.hasOwnProperty(e)){f=c[e];if("undefined"==typeof this.functionsResults[f-1])throw Error("Wrong reference in '"+a["function"]+"' function. Function #"+f+" does not call yet.");if("undefined"==typeof b[e]||""==b[e])throw Error("Wrong reference in '"+a["function"]+"' function. Empty '"+e+"' argument.");d=b[e];if("undefined"==typeof this.functionsResults[f-1][d])throw Error("Wrong reference in '"+
 a["function"]+"' function. There is no '"+d+"' argument in #"+f+" function results");b[e]=this.functionsResults[f-1][d]}return b};MibewAPIExecutionContext.prototype.getResults=function(){return this.returnValues};
-MibewAPIExecutionContext.prototype.storeFunctionResults=function(a,b){var c,d;for(d in a.arguments["return"])if(a.arguments["return"].hasOwnProperty(d)){c=a.arguments["return"][d];if("undefined"==typeof b[d])throw Error("Variable with name '"+d+"' is undefined in the results of the '"+a["function"]+"' function");this.returnValues[c]=b[d]}this.functionsResults.push(b)};
+MibewAPIExecutionContext.prototype.storeFunctionResults=function(a,b){var c;if(b.errorCode)this.returnValues.errorCode=b.errorCode,this.returnValues.errorMessage=b.errorMessage||"";else for(var d in a.arguments["return"])if(a.arguments["return"].hasOwnProperty(d)){c=a.arguments["return"][d];if("undefined"==typeof b[d])throw Error("Variable with name '"+d+"' is undefined in the results of the '"+a["function"]+"' function");this.returnValues[c]=b[d]}this.functionsResults.push(b)};
diff --git a/src/messenger/webim/js/source/mibewapi.js b/src/messenger/webim/js/source/mibewapi.js
index c4fd445a..96cea319 100644
--- a/src/messenger/webim/js/source/mibewapi.js
+++ b/src/messenger/webim/js/source/mibewapi.js
@@ -470,20 +470,28 @@ MibewAPIExecutionContext.prototype.getResults = function(){
  */
 MibewAPIExecutionContext.prototype.storeFunctionResults = function(functionObject, results) {
     var alias;
-    // Add value to request results
-    for (var argName in functionObject.arguments["return"]) {
-        if (! functionObject.arguments["return"].hasOwnProperty(argName)) {
-            continue;
+    // Check if function return correct results
+    if (!results.errorCode) {
+        // Add value to request results
+        for (var argName in functionObject.arguments["return"]) {
+            if (! functionObject.arguments["return"].hasOwnProperty(argName)) {
+                continue;
+            }
+            alias = functionObject.arguments["return"][argName];
+            if (typeof results[argName] == "undefined") {
+                throw new Error(
+                    "Variable with name '" + argName + "' is undefined in " +
+                    "the results of the '" + functionObject['function'] +
+                    "' function"
+                );
+            }
+            this.returnValues[alias] = results[argName];
         }
-        alias = functionObject.arguments["return"][argName];
-        if (typeof results[argName] == "undefined") {
-            throw new Error(
-                "Variable with name '" + argName + "' is undefined in " +
-                "the results of the '" + functionObject['function'] +
-                "' function"
-            );
-        }
-        this.returnValues[alias] = results[argName];
+    } else {
+        // Something went wrong during function execution
+        // Store error code and error message
+        this.returnValues.errorCode = results.errorCode;
+        this.returnValues.errorMessage = results.errorMessage || '';
     }
     // Store function results in execution context
     this.functionsResults.push(results);
diff --git a/src/messenger/webim/libs/classes/mibew_api_execution_context.php b/src/messenger/webim/libs/classes/mibew_api_execution_context.php
index 3aefe686..7a924426 100644
--- a/src/messenger/webim/libs/classes/mibew_api_execution_context.php
+++ b/src/messenger/webim/libs/classes/mibew_api_execution_context.php
@@ -98,18 +98,29 @@ Class MibewAPIExecutionContext {
 	 * @throws MibewAPIException
 	 */
 	public function storeFunctionResults ($function, $results) {
-		// Add value to request results
-		foreach ($function['arguments']['return'] as $name => $alias) {
-			if (! isset($results[$name])) {
-				// Value that defined in 'return' argument is undefined
-				throw new MibewAPIException(
-					"Variable with name '{$name}' is undefined in the " .
-					"results of the '{$function['function']}' function",
-					MibewAPIException::VARIABLE_IS_UNDEFINED_IN_RESULT
-				);
+		// Check if function return correct results
+		if (empty($results['errorCode'])) {
+			// Add value to request results
+			foreach ($function['arguments']['return'] as $name => $alias) {
+				if (! isset($results[$name])) {
+					// Value that defined in 'return' argument is undefined
+					throw new MibewAPIException(
+						"Variable with name '{$name}' is undefined in the " .
+						"results of the '{$function['function']}' function",
+						MibewAPIException::VARIABLE_IS_UNDEFINED_IN_RESULT
+					);
+				}
+				$this->return[$alias] = $results[$name];
 			}
-			$this->return[$alias] = $results[$name];
+		} else {
+			// Something went wrong during function execution
+			// Store error code and error message
+			$this->return['errorCode'] = $results['errorCode'];
+			$this->return['errorMessage'] = empty($results['errorMessage'])
+				? ''
+				: $results['errorMessage'];
 		}
+
 		// Store function results in execution context
 		$this->functions_results[] = $results;
 	}