diff --git a/src/query/src/tdigest.c b/src/query/src/tdigest.c
index 109fd7574f04a7f82e92f112551ca9494c7e667a..4870d1ff60d2cd7db69a01587d5e48515bdf67d7 100644
--- a/src/query/src/tdigest.c
+++ b/src/query/src/tdigest.c
@@ -296,7 +296,7 @@ double tdigestQuantile(TDigest *t, double q) {
     a = b;
     right = t->max;
 
-    if (idx < weight_so_far + a->weight) {
+    if (idx < weight_so_far + a->weight && a->weight != 0) {
         double p = (idx - weight_so_far) / a->weight;
         return left * (1 - p) + right * p;
     }