diff --git a/lib/checkclass.cpp b/lib/checkclass.cpp
index 04746676b..f172a9d3d 100644
--- a/lib/checkclass.cpp
+++ b/lib/checkclass.cpp
@@ -435,7 +435,7 @@ void CheckClass::initializeVarList(const Function &func, std::list<const Functio
     bool initList = func.isConstructor();
     const Token *ftok = func.arg->link()->next();
     int level = 0;
-    for (; ftok != func.functionScope->classEnd; ftok = ftok->next()) {
+    for (; ftok && ftok != func.functionScope->classEnd; ftok = ftok->next()) {
         // Class constructor.. initializing variables like this
         // clKalle::clKalle() : var(value) { }
         if (initList) {
diff --git a/test/testconstructors.cpp b/test/testconstructors.cpp
index 044e5d655..5ef19fa02 100644
--- a/test/testconstructors.cpp
+++ b/test/testconstructors.cpp
@@ -162,6 +162,7 @@ private:
         TEST_CASE(uninitVarOperatorEqual); // ticket #2415
         TEST_CASE(uninitVarPointer);       // ticket #3801
         TEST_CASE(uninitConstVar);
+        TEST_CASE(constructors_crash1);  // ticket #5641
     }
 
 
@@ -2901,6 +2902,16 @@ private:
               "};");
         ASSERT_EQUALS("", errout.str());
     }
+
+    // Ticket #5641 "Regression. Crash for 'C() _STLP_NOTHROW {}'"
+    void constructors_crash1() {
+        check("class C {\n"
+                          "public:\n"
+                          "  C() _STLP_NOTHROW {}\n"
+                          "  C(const C&) _STLP_NOTHROW {}\n"
+                          "};\n");
+        ASSERT_EQUALS("", errout.str());
+    }
 };
 
 REGISTER_TEST(TestConstructors)