1 files changed, 2 insertions, 0 deletions
diff --git a/blackbox.c b/blackbox.c
index 43323f9..ab8e382 100644
--- a/blackbox.c
+++ b/blackbox.c
@@ -198,6 +198,8 @@ static const char *validate_params(const game_params *params, bool full)
         return "Widths and heights greater than 255 are not supported";
     if (params->minballs < 0)
         return "Negative number of balls";
+    if (params->minballs < 1)
+        return "Number of balls must be at least one";
     if (params->minballs > params->maxballs)
         return "Minimum number of balls may not be greater than maximum";
     if (params->minballs >= params->w * params->h)