diff --git a/src/Matrix.cpp b/src/Matrix.cpp
index 2094229..0d9f346 100644
--- a/src/Matrix.cpp
+++ b/src/Matrix.cpp
@@ -423,12 +423,14 @@ namespace Aurora {
     Matrix Matrix::operator^(int times) const { return operatorMxA(&vdPowI, times, *this);}
     Matrix operator^( Matrix &&matrix,int times) {
         return operatorMxA(&vdPowI, times, std::forward<Matrix&&>(matrix));
-    }
-    
-
-
+    }    
 
     void Matrix::printf() {
+        if(isNull())
+        {
+            ::printf("null matrix\n");
+            return;
+        }
         int k_count = getDimSize(2);
         int j_count = getDimSize(1);
         int complexstep = 1;