diff --git a/modules/core/src/norm.dispatch.cpp b/modules/core/src/norm.dispatch.cpp
index 9f02df47e7..6999e55cdf 100644
--- a/modules/core/src/norm.dispatch.cpp
+++ b/modules/core/src/norm.dispatch.cpp
@@ -571,7 +571,7 @@ double norm( InputArray _src1, InputArray _src2, int normType, InputArray _mask
               ((normType == NORM_HAMMING || normType == NORM_HAMMING2) && src1.type() == CV_8U) );
 
     NormDiffFunc func = getNormDiffFunc(normType >> 1, depth == CV_16F ? CV_32F : depth);
-    CV_Assert( func != 0 );
+    CV_Assert( (normType >> 1) >= 3 || func != 0 );
 
     if( src1.isContinuous() && src2.isContinuous() && mask.empty() )
     {
diff --git a/modules/core/src/norm.simd.hpp b/modules/core/src/norm.simd.hpp
index 05227dde90..68bd21258e 100644
--- a/modules/core/src/norm.simd.hpp
+++ b/modules/core/src/norm.simd.hpp
@@ -1350,6 +1350,7 @@ NormDiffFunc getNormDiffFunc(int normType, int depth)
             (NormDiffFunc)normDiffL2_64f, 0
         }
     };
+    if (normType >= 3 || normType < 0) return nullptr;
 
     return normDiffTab[normType][depth];
 }