diff --git a/python/python-psi-impl/src/com/jetbrains/python/psi/types/functionalParser/ParserException.java b/python/python-psi-impl/src/com/jetbrains/python/psi/types/functionalParser/ParserException.java
index 1afc7a8dadd6..216250cac8a3 100644
--- a/python/python-psi-impl/src/com/jetbrains/python/psi/types/functionalParser/ParserException.java
+++ b/python/python-psi-impl/src/com/jetbrains/python/psi/types/functionalParser/ParserException.java
@@ -20,7 +20,7 @@ import org.jetbrains.annotations.NotNull;
 /**
 * @author vlan
 */
-public class ParserException extends Exception {
+public final class ParserException extends Exception {
   @NotNull private final FunctionalParserBase.State myState;
 
   public ParserException(@NotNull String message, @NotNull FunctionalParserBase.State state) {
@@ -32,4 +32,9 @@ public class ParserException extends Exception {
   FunctionalParserBase.State getState() {
     return myState;
   }
+
+  @Override
+  public synchronized Throwable fillInStackTrace() {
+    return this;
+  }
 }