diff --git a/modules/core/src/precomp.hpp b/modules/core/src/precomp.hpp
index c53224e0aa..ec8dcc9f23 100644
--- a/modules/core/src/precomp.hpp
+++ b/modules/core/src/precomp.hpp
@@ -129,12 +129,14 @@ template<typename T> struct OpMax
 
 inline Size getContinuousSize( const Mat& m1, int widthScale=1 )
 {
+    CV_Assert(m1.dims <= 2);
     return m1.isContinuous() ? Size(m1.cols*m1.rows*widthScale, 1) :
         Size(m1.cols*widthScale, m1.rows);
 }
 
 inline Size getContinuousSize( const Mat& m1, const Mat& m2, int widthScale=1 )
 {
+    CV_Assert(m1.dims <= 2 && m1.size() == m2.size());
     return (m1.flags & m2.flags & Mat::CONTINUOUS_FLAG) != 0 ?
         Size(m1.cols*m1.rows*widthScale, 1) : Size(m1.cols*widthScale, m1.rows);
 }
@@ -142,6 +144,7 @@ inline Size getContinuousSize( const Mat& m1, const Mat& m2, int widthScale=1 )
 inline Size getContinuousSize( const Mat& m1, const Mat& m2,
                                const Mat& m3, int widthScale=1 )
 {
+    CV_Assert(m1.dims <= 2 && m1.size() == m2.size() && m1.size() == m3.size());
     return (m1.flags & m2.flags & m3.flags & Mat::CONTINUOUS_FLAG) != 0 ?
         Size(m1.cols*m1.rows*widthScale, 1) : Size(m1.cols*widthScale, m1.rows);
 }
@@ -150,6 +153,7 @@ inline Size getContinuousSize( const Mat& m1, const Mat& m2,
                                const Mat& m3, const Mat& m4,
                                int widthScale=1 )
 {
+    CV_Assert(m1.dims <= 2 && m1.size() == m2.size() && m1.size() == m3.size() && m1.size() == m4.size());
     return (m1.flags & m2.flags & m3.flags & m4.flags & Mat::CONTINUOUS_FLAG) != 0 ?
         Size(m1.cols*m1.rows*widthScale, 1) : Size(m1.cols*widthScale, m1.rows);
 }
@@ -158,6 +162,7 @@ inline Size getContinuousSize( const Mat& m1, const Mat& m2,
                                const Mat& m3, const Mat& m4,
                                const Mat& m5, int widthScale=1 )
 {
+    CV_Assert(m1.dims <= 2 && m1.size() == m2.size() && m1.size() == m3.size() && m1.size() == m4.size() && m1.size() == m5.size());
     return (m1.flags & m2.flags & m3.flags & m4.flags & m5.flags & Mat::CONTINUOUS_FLAG) != 0 ?
         Size(m1.cols*m1.rows*widthScale, 1) : Size(m1.cols*widthScale, m1.rows);
 }