diff --git a/lib/mfrc522/source/loop.php b/lib/mfrc522/source/loop.php
index 9c37c63..8918f94 100755
--- a/lib/mfrc522/source/loop.php
+++ b/lib/mfrc522/source/loop.php
@@ -164,7 +164,7 @@
 			$action = $actionlist[$id_action];
 
 			/* (4) Check if the state allows the action to be performed */
-			for( $c = 0 ; $c < strlen($state) || $c < strlen($action['prev']) ; $c++ ){
+			for( $c = 0 ; $c < strlen($state) && $c < strlen($action['prev']) ; $c++ ){
 				// {1} 'X' = any state -> so ignore //
 				if( $action['prev'][$c] == 'X' )
 					continue;
@@ -197,7 +197,7 @@
 		/* [5] Process the action on the STATE
 		=========================================================*/
 		/* (1) Update the state with the found action */
-		for( $c = 0 ; $c < strlen($state) || $c < strlen($action['next']) ; $c++ ){
+		for( $c = 0 ; $c < strlen($state) && $c < strlen($action['next']) ; $c++ ){
 
 			// {1} If 'x' -> let the current state //
 			if( $action['next'][$c] == 'X' )