diff --git a/detect.cc b/detect.cc
index b08ed3f..7396cc5 100644
--- a/detect.cc
+++ b/detect.cc
@@ -76,7 +76,7 @@ void Detect::Thread() {
 
 	objectX = -1;
 	objectY = -1;
-	output.detmatrix = malloc (sizeof(uint32_t) * DET_MAXSHIFT * DET_MAXSHIFT);
+	output.detmatrix = (uint32_t*)malloc (sizeof(uint32_t) * DET_MAXSHIFT * DET_MAXSHIFT);
 
 	while (running) {
 		// check for new frame
@@ -127,7 +127,8 @@ void Detect::Thread() {
 			output.posx = objectX;
 			output.posy = objectY;
 			output.image = &imagegtk;
-			memcpy (output.detmatrix, detmatrix, sizeof(uint32_t) * DET_MAXSHIFT * DET_MAXSHIFT);
+			if (detmatrix != NULL)
+				memcpy (output.detmatrix, detmatrix, sizeof(uint32_t) * DET_MAXSHIFT * DET_MAXSHIFT);
 
 			UnLockMutex();					// unlock Config
 
diff --git a/detect.h b/detect.h
index 2ce8da2..ee90f8f 100644
--- a/detect.h
+++ b/detect.h
@@ -29,7 +29,7 @@ enum {
 
 struct  {
 	VideoFrame *image;	// detected image
-	uint16_t *detmatrix;
+	uint32_t *detmatrix;
 	int posx;			// position of the detected object
 	int posy;			// position of the detected object
 } typedef DetectOutput;