diff --git a/lib/tokenize.cpp b/lib/tokenize.cpp
index bb7d7480c..8899aa9b8 100644
--- a/lib/tokenize.cpp
+++ b/lib/tokenize.cpp
@@ -5131,9 +5131,11 @@ void Tokenizer::simplifyVarDecl(bool only_k_r_fpar)
 
                 else if (strchr(";,", tok2->str()[0])) {
                     // "type var ="   =>   "type var; var ="
-                    Token *VarTok = type0->tokAt((int)typelen);
+                    const Token *VarTok = type0->tokAt((int)typelen);
                     while (Token::Match(VarTok, "*|&|const"))
                         VarTok = VarTok->next();
+		    if (!VarTok)
+		      break; // ticket 4245 - invalid code probably
                     list.insertTokens(eq, VarTok, 2);
                     eq->str(";");
 
diff --git a/test/testtokenize.cpp b/test/testtokenize.cpp
index 86b9aa4eb..cfd38c763 100644
--- a/test/testtokenize.cpp
+++ b/test/testtokenize.cpp
@@ -58,6 +58,7 @@ private:
         TEST_CASE(tokenize23);  // tokenize "return - __LINE__;"
         TEST_CASE(tokenize24);  // #4195 (segmentation fault)
         TEST_CASE(tokenize25);  // #4239 (segmentation fault)
+        TEST_CASE(tokenize26);  // #4245 (segmentation fault)
 
         // don't freak out when the syntax is wrong
         TEST_CASE(wrong_syntax1);
@@ -651,6 +652,11 @@ private:
     void tokenize25() {
         tokenizeAndStringify("f ( struct { int typedef T x ; } ) { }");
     }
+    
+    // #4245 - segfault
+    void tokenize26() {
+        tokenizeAndStringify("class x { protected : template < int y = } ;");
+    }
 
     void wrong_syntax1() {
         {