diff --git a/cmpUtil.php b/cmpUtil.php
index 2afce92..4c64810 100644
--- a/cmpUtil.php
+++ b/cmpUtil.php
@@ -193,7 +193,7 @@
 
 			$this->appendConf($obj);
 
-			if(@$this->parm["timezone"]) {
+			if(isset($this->parm["timezone"]) && $this->parm["timezone"]) {
 				$this->d("Set timezone '" . $this->parm["timezone"] . "'");
 				date_default_timezone_set($this->parm["timezone"]);
 			}
@@ -202,7 +202,7 @@
 				$this->parm["maxFileSize"] = 1048576;
 			$this->d("Set maxFileSize '" . $this->parm["maxFileSize"] . "'");
 
-			if(is_array(@$this->parm["php_ini"])) {
+			if(isset($this->parm["php_ini"]) && is_array($this->parm["php_ini"])) {
 				foreach($this->parm["php_ini"] as $k => $v) {
 					ini_set($k, $v);
 				}
@@ -403,10 +403,15 @@
 
 		function cmpSysExecEventSwo(&$ppsAll, &$opt) {
 			do {
-				if(!@$opt["stdInEventAdd"])
+				if(!isset($opt["stdInEventAdd"]) || !$opt["stdInEventAdd"])
 					break;
 
-				if(!is_callable(@$opt["stdInEventAdd"]["call"])) {
+				if(!isset($opt["stdInEventAdd"]["call"])) {
+					$this->d("Unset callable stdInEventAdd");
+					break;
+				}
+
+				if(!is_callable($opt["stdInEventAdd"]["call"])) {
 					$this->d("Invalid callable stdInEventAdd");
 					break;
 				}
@@ -421,10 +426,15 @@
 			} while(0);
 
 			do {
-				if(!@$opt["stdOutEventAdd"])
+				if(!isset($opt["stdOutEventAdd"]) || !$opt["stdOutEventAdd"])
 					break;
 
-				if(!is_callable(@$opt["stdOutEventAdd"]["call"])) {
+				if(!isset($opt["stdOutEventAdd"]["call"])) {
+					$this->d("Unset callable stdOutEventAdd");
+					break;
+				}
+
+				if(!is_callable($opt["stdOutEventAdd"]["call"])) {
 					$this->d("Invalid callable stdOutEventAdd");
 					break;
 				}
@@ -439,10 +449,15 @@
 			} while(0);
 
 			do {
-				if(!@$opt["stdErrEventAdd"])
+				if(!isset($opt["stdErrEventAdd"]) || !$opt["stdErrEventAdd"])
 					break;
 
-				if(!is_callable(@$opt["stdErrEventAdd"]["call"])) {
+				if(!isset($opt["stdErrEventAdd"]["call"])) {
+					$this->d("Unset callable stdErrEventAdd");
+					break;
+				}
+
+				if(!is_callable($opt["stdErrEventAdd"]["call"])) {
 					$this->d("Invalid callable stdErrEventAdd");
 					break;
 				}
@@ -460,14 +475,19 @@
 				if(!isset($opt["eventWait"]) || !$opt["eventWait"])
 					break;
 
-				if(!isset($opt["silent"]) || !$opt["silent"])
-					$this->d("Call eventWait");
+				if(!isset($opt["eventWait"]["call"])) {
+					$this->d("Unset callable eventWait");
+					break;
+				}
 
-				if(!is_callable(@$opt["eventWait"]["call"])) {
+				if(!is_callable($opt["eventWait"]["call"])) {
 					$this->d("Invalid callable eventWait");
 					break;
 				}
 
+				if(!isset($opt["silent"]) || !$opt["silent"])
+					$this->d("Call eventWait");
+
 				($opt["eventWait"]["call"])();
 			} while(0);
 
@@ -528,7 +548,7 @@
 				stream_set_blocking($ppsAll[1], $blk);
 				stream_set_blocking($ppsAll[2], $blk);
 
-				if(@$opt["stdin"]) {
+				if(isset($opt["stdin"]) && $opt["stdin"]) {
 					fwrite($ppsAll[0], $opt["stdin"]);
 					fclose($ppsAll[0]);
 				}
@@ -564,10 +584,10 @@
 
 			$val = 0;
 
-			if(@$opt["retval"])
+			if(isset($opt["retval"]) && $opt["retval"])
 				$val = $opt["retval"];
 
-			if(!@$opt["noerror"]) {
+			if(!isset($opt["noerror"]) || !$opt["noerror"]) {
 				if($retVal !== $val) {
 					if(!isset($opt["silent"]) || !$opt["silent"]) {
 						$this->d($err);
@@ -582,17 +602,18 @@
 				}
 			}
 
+			if(isset($opt["return"]) && $opt["return"]) {
+				switch(@$opt["return"]) {
+					case "retval":
+						return 1*$retVal;
 
-			switch(@$opt["return"]) {
-				case "retval":
-					return 1*$retVal;
+					case "outstr":
+						return $out;
 
-				case "outstr":
-					return $out;
-
-				case "outarr":
-				default:
-					return explode("\n", $out);
+					case "outarr":
+					default:
+						return explode("\n", $out);
+				}
 			}
 
 			return explode("\n", $out);