diff --git a/src/r_data/gldefs.cpp b/src/r_data/gldefs.cpp
index be4645699..2c6dbf8fb 100644
--- a/src/r_data/gldefs.cpp
+++ b/src/r_data/gldefs.cpp
@@ -1210,6 +1210,11 @@ class GLDefsParser
 		FTextureID no = TexMan.CheckForTexture(sc.String, type, FTextureManager::TEXMAN_TryAny | FTextureManager::TEXMAN_Overridable);
 		FTexture *tex = TexMan.GetTexture(no);
 
+		if (tex == nullptr)
+		{
+			sc.ScriptMessage("Material definition refers nonexistent texture '%s'\n", sc.String);
+		}
+
 		sc.MustGetToken('{');
 		while (!sc.CheckToken('}'))
 		{
@@ -1266,26 +1271,29 @@ class GLDefsParser
 					}
 				}
 				sc.MustGetString();
-				bool okay = false;
-				for (int i = 0; i < MAX_CUSTOM_HW_SHADER_TEXTURES; i++)
+				if (tex)
 				{
-					if (!tex->CustomShaderTextures[i])
+					bool okay = false;
+					for (int i = 0; i < MAX_CUSTOM_HW_SHADER_TEXTURES; i++)
 					{
-						tex->CustomShaderTextures[i] = TexMan.FindTexture(sc.String, ETextureType::Any, FTextureManager::TEXMAN_TryAny);
 						if (!tex->CustomShaderTextures[i])
 						{
-							sc.ScriptError("Custom hardware shader texture '%s' not found in texture '%s'\n", sc.String, tex ? tex->Name.GetChars() : "(null)");
-						}
+							tex->CustomShaderTextures[i] = TexMan.FindTexture(sc.String, ETextureType::Any, FTextureManager::TEXMAN_TryAny);
+							if (!tex->CustomShaderTextures[i])
+							{
+								sc.ScriptError("Custom hardware shader texture '%s' not found in texture '%s'\n", sc.String, tex->Name.GetChars());
+							}
 
-						texNameList.Push(textureName);
-						texNameIndex.Push(i);
-						okay = true;
-						break;
+							texNameList.Push(textureName);
+							texNameIndex.Push(i);
+							okay = true;
+							break;
+						}
+					}
+					if (!okay)
+					{
+						sc.ScriptError("Error: out of texture units in texture '%s'", tex->Name.GetChars());
 					}
-				}
-				if (!okay)
-				{
-					sc.ScriptError("Error: out of texture units in texture '%s'", tex ? tex->Name.GetChars() : "(null)");
 				}
 			}
 			else if (sc.Compare("define"))
diff --git a/wadsrc_extra/static/filter/game-heretic/fonts/defbigfont/0021.lmp b/wadsrc_extra/static/filter/game-heretic/fonts/defbigfont/0021.lmp
new file mode 100644
index 000000000..8ebc24571
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diff --git a/wadsrc_extra/static/filter/game-heretic/fonts/defbigfont/00A1.lmp b/wadsrc_extra/static/filter/game-heretic/fonts/defbigfont/00A1.lmp
new file mode 100644
index 000000000..1759c1d2e
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diff --git a/wadsrc_extra/static/filter/game-hexen/fonts/defbigfont/0021.lmp b/wadsrc_extra/static/filter/game-hexen/fonts/defbigfont/0021.lmp
new file mode 100644
index 000000000..14ccedfb4
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diff --git a/wadsrc_extra/static/filter/game-hexen/fonts/defbigfont/00A1.lmp b/wadsrc_extra/static/filter/game-hexen/fonts/defbigfont/00A1.lmp
new file mode 100644
index 000000000..81dc7814e
Binary files /dev/null and b/wadsrc_extra/static/filter/game-hexen/fonts/defbigfont/00A1.lmp differ