diff --git a/modules/imgproc/src/contours_new.cpp b/modules/imgproc/src/contours_new.cpp
index 67bc7aa2dd..ed48f1e1ff 100644
--- a/modules/imgproc/src/contours_new.cpp
+++ b/modules/imgproc/src/contours_new.cpp
@@ -649,7 +649,7 @@ void cv::findContours(InputArray _image,
     }
 
     // Fast path: RETR_LIST without hierarchy → findTRUContours (parallel contour extraction)
-    if (mode == RETR_LIST && !_hierarchy.needed())
+    if (mode == RETR_LIST && !_hierarchy.needed() && _image.type() == CV_8UC1)
     {
         // findTRUContours requires FOREGROUND=255; binarize=true thresholds the padded
         // image in-place, avoiding an extra allocation (findContours accepts any non-zero value)
diff --git a/modules/imgproc/src/contours_truco.cpp b/modules/imgproc/src/contours_truco.cpp
index a4d3c0cce0..94f1f332f6 100644
--- a/modules/imgproc/src/contours_truco.cpp
+++ b/modules/imgproc/src/contours_truco.cpp
@@ -618,7 +618,7 @@ void findTRUContours(InputArray _src, OutputArrayOfArrays _contours, int minSize
 {
     CV_INSTRUMENT_REGION();
     Mat src = _src.getMat();
-    CV_Assert(!src.empty() && src.type() == CV_8UC1);
+    CV_Assert(src.type() == CV_8UC1);
 
     // Buffer handling
     cv::Mat padded;