diff --git a/libfreerdp/cache/glyph.c b/libfreerdp/cache/glyph.c
index f1fcd1ff9..09c8149bd 100644
--- a/libfreerdp/cache/glyph.c
+++ b/libfreerdp/cache/glyph.c
@@ -796,6 +796,9 @@ CACHE_GLYPH_ORDER* copy_cache_glyph_order(rdpContext* context, const CACHE_GLYPH
 
 	if (glyph->unicodeCharacters)
 	{
+		if (glyph->cGlyphs == 0)
+			goto fail;
+
 		dst->unicodeCharacters = calloc(glyph->cGlyphs, sizeof(WCHAR));
 
 		if (!dst->unicodeCharacters)
@@ -855,6 +858,9 @@ CACHE_GLYPH_V2_ORDER* copy_cache_glyph_v2_order(rdpContext* context,
 
 	if (glyph->unicodeCharacters)
 	{
+		if (glyph->cGlyphs == 0)
+			goto fail;
+
 		dst->unicodeCharacters = calloc(glyph->cGlyphs, sizeof(WCHAR));
 
 		if (!dst->unicodeCharacters)