diff --git a/src/proxy.php b/src/proxy.php
index 377e2fb..7ca7415 100644
--- a/src/proxy.php
+++ b/src/proxy.php
@@ -60,17 +60,15 @@ try{
 
 		if($id === null){
 
-			// fallback to getting ID from path
-			$id = explode("/", $image["path"]);
+			$id = explode("/th/id/", $image["path"], 2);
 
-			for($i=count($id) - 1; $i>0; $i--){
+			if(count($id) !== 2){
 
-				if(trim($id[$i]) != ""){
-
-					$id = $id[$i];
-					break;
-				}
+				// malformed
+				return $url;
 			}
+
+			$id = $id[1];
 		}
 
 		if(is_array($id)){