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-rw-r--r--Src/prompt.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/Src/prompt.c b/Src/prompt.c
index 4603ffba6..f2b3f161e 100644
--- a/Src/prompt.c
+++ b/Src/prompt.c
@@ -1663,6 +1663,8 @@ match_colour(const char **teststrp, int is_fg, int colour)
 		/* default */
 		return is_fg ? TXTNOFGCOLOUR : TXTNOBGCOLOUR;
 	    }
+	    if (colour < 0)
+		return TXT_ERROR;
 	}
 	else {
 	    colour = (int)zstrtol(*teststrp, (char **)teststrp, 10);