diff --git a/xtoskrnl/hl/fbdev.c b/xtoskrnl/hl/fbdev.c
index 3d169c2..c248f9c 100644
--- a/xtoskrnl/hl/fbdev.c
+++ b/xtoskrnl/hl/fbdev.c
@@ -28,6 +28,13 @@ HlClearScreen(IN ULONG Color)
     ULONG BackgroundColor;
     PULONG FrameBuf;
 
+    /* Make sure frame buffer is already initialized */
+    if(HlpFrameBufferData.Initialized == FALSE)
+    {
+        /* Unable to operate on non-initialized frame buffer */
+        return;
+    }
+
     /* Get pointer to frame buffer */
     FrameBuf = HlpFrameBufferData.Address;
 
@@ -198,6 +205,13 @@ HlPutCharacter(IN ULONG PositionX,
     PSSFN_FONT_HEADER FbFont;
     ULONG FontColor;
 
+    /* Make sure frame buffer is already initialized */
+    if(HlpFrameBufferData.Initialized == FALSE)
+    {
+        /* Unable to operate on non-initialized frame buffer */
+        return;
+    }
+
     /* Get pointers to font data */
     FbFont = (PSSFN_FONT_HEADER)HlpFrameBufferData.Font;
     CharacterMapping = (PUCHAR)FbFont + FbFont->CharactersOffset;