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-rw-r--r--src/nvim/highlight.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/nvim/highlight.c b/src/nvim/highlight.c
index b01cdde236..5163752e1f 100644
--- a/src/nvim/highlight.c
+++ b/src/nvim/highlight.c
@@ -517,6 +517,10 @@ static HlAttrs get_colors_force(int attr)
/// @return the resulting attributes.
int hl_blend_attrs(int back_attr, int front_attr, bool *through)
{
+ if (front_attr < 0 || back_attr < 0) {
+ return -1;
+ }
+
HlAttrs fattrs = get_colors_force(front_attr);
int ratio = fattrs.hl_blend;
if (ratio <= 0) {