diff --git a/src/engine/client/graphics_threaded.cpp b/src/engine/client/graphics_threaded.cpp
index efe7ff03d72..3806d15decc 100644
--- a/src/engine/client/graphics_threaded.cpp
+++ b/src/engine/client/graphics_threaded.cpp
@@ -330,6 +330,9 @@ static bool ConvertToRGBA(uint8_t *pDest, const uint8_t *pSrc, size_t SrcWidth,
 
 int CGraphics_Threaded::LoadTextureRawSub(CTextureHandle TextureID, int x, int y, int Width, int Height, int Format, const void *pData)
 {
+	dbg_assert(Width > 0, "LoadTextureRawSub: Width is negative or zero");
+	dbg_assert(Height > 0, "LoadTextureRawSub: Height is negative or zero");
+
 	CCommandBuffer::SCommand_Texture_Update Cmd;
 	Cmd.m_Slot = TextureID.Id();
 	Cmd.m_X = x;
@@ -421,6 +424,9 @@ bool CGraphics_Threaded::IsSpriteTextureFullyTransparent(CImageInfo &FromImageIn
 
 IGraphics::CTextureHandle CGraphics_Threaded::LoadTextureRaw(int Width, int Height, int Format, const void *pData, int StoreFormat, int Flags, const char *pTexName)
 {
+	dbg_assert(Width > 0, "LoadTextureRaw: Width is negative or zero");
+	dbg_assert(Height > 0, "LoadTextureRaw: Height is negative or zero");
+
 	// don't waste memory on texture if we are stress testing
 #ifdef CONF_DEBUG
 	if(g_Config.m_DbgStress && m_InvalidTexture.IsValid())
@@ -533,6 +539,9 @@ IGraphics::CTextureHandle CGraphics_Threaded::InvalidTexture() const
 
 bool CGraphics_Threaded::LoadTextTextures(int Width, int Height, CTextureHandle &TextTexture, CTextureHandle &TextOutlineTexture, void *pTextData, void *pTextOutlineData)
 {
+	dbg_assert(Width > 0, "LoadTextTextures: Width is negative or zero");
+	dbg_assert(Height > 0, "LoadTextTextures: Height is negative or zero");
+
 	if(Width == 0 || Height == 0)
 		return false;
 
@@ -608,6 +617,9 @@ bool CGraphics_Threaded::UnloadTextTextures(CTextureHandle &TextTexture, CTextur
 
 bool CGraphics_Threaded::UpdateTextTexture(CTextureHandle TextureID, int x, int y, int Width, int Height, const void *pData)
 {
+	dbg_assert(Width > 0, "UpdateTextTexture: Width is negative or zero");
+	dbg_assert(Height > 0, "UpdateTextTexture: Height is negative or zero");
+
 	CCommandBuffer::SCommand_TextTexture_Update Cmd;
 	Cmd.m_Slot = TextureID.Id();
 	Cmd.m_X = x;