diff --git a/modules/core/src/norm.dispatch.cpp b/modules/core/src/norm.dispatch.cpp
index 6999e55cdf..a20eaf0824 100644
--- a/modules/core/src/norm.dispatch.cpp
+++ b/modules/core/src/norm.dispatch.cpp
@@ -316,7 +316,7 @@ double norm( InputArray _src, int normType, InputArray _mask )
     }
 
     NormFunc func = getNormFunc(normType >> 1, depth == CV_16F ? CV_32F : depth);
-    CV_Assert( func != 0 );
+    CV_Assert( (normType >> 1) >= 3 || func != 0 );
 
     if( src.isContinuous() && mask.empty() )
     {
diff --git a/modules/core/src/norm.simd.hpp b/modules/core/src/norm.simd.hpp
index 68bd21258e..1e94fff719 100644
--- a/modules/core/src/norm.simd.hpp
+++ b/modules/core/src/norm.simd.hpp
@@ -1324,6 +1324,8 @@ NormFunc getNormFunc(int normType, int depth)
         }
     };
 
+    if (normType >= 3 || normType < 0) return nullptr;
+
     return normTab[normType][depth];
 }