diff --git a/src/com/magento/idea/magento2uct/util/php/MagentoTypeEscapeUtil.java b/src/com/magento/idea/magento2uct/util/php/MagentoTypeEscapeUtil.java
index 7f6d37b84..ce910cea9 100644
--- a/src/com/magento/idea/magento2uct/util/php/MagentoTypeEscapeUtil.java
+++ b/src/com/magento/idea/magento2uct/util/php/MagentoTypeEscapeUtil.java
@@ -32,7 +32,13 @@ private MagentoTypeEscapeUtil() {
         String result = typeFqn;
 
         while (matcher.find()) {
-            result = result.substring(0, matcher.start(0)) + result.substring(matcher.end(0));
+            final int begin = matcher.start(0);
+            final int end = matcher.end(0);
+
+            if (begin < 0 || begin > end || end > result.length()) {
+                continue;
+            }
+            result = result.substring(0, begin) + result.substring(end);
         }
 
         return typeFqn.equals(result) ? typeFqn : result;