diff --git a/src/Interpreters/GatherFunctionQuantileVisitor.cpp b/src/Interpreters/GatherFunctionQuantileVisitor.cpp
index ec3866ba0c0..3eb474c271c 100644
--- a/src/Interpreters/GatherFunctionQuantileVisitor.cpp
+++ b/src/Interpreters/GatherFunctionQuantileVisitor.cpp
@@ -47,7 +47,7 @@ void GatherFunctionQuantileData::visit(ASTFunction & function, ASTPtr & ast)
 void GatherFunctionQuantileData::FuseQuantileAggregatesData::addFuncNode(ASTPtr & ast)
 {
     const auto * func = ast->as<ASTFunction>();
-    if (!func)
+    if (!func || func->parameters == nullptr)
         return;
 
     const auto & arguments = func->arguments->children;
diff --git a/tests/queries/0_stateless/01956_fuse_quantile_optimization.reference b/tests/queries/0_stateless/01956_fuse_quantile_optimization.reference
index defad422cad..d4cb1477ed6 100644
--- a/tests/queries/0_stateless/01956_fuse_quantile_optimization.reference
+++ b/tests/queries/0_stateless/01956_fuse_quantile_optimization.reference
@@ -95,3 +95,4 @@ FROM
     FROM numbers(10)
 )
 GROUP BY b
+1	1	1
diff --git a/tests/queries/0_stateless/01956_fuse_quantile_optimization.sql b/tests/queries/0_stateless/01956_fuse_quantile_optimization.sql
index 2a97c60882c..a4729e89755 100644
--- a/tests/queries/0_stateless/01956_fuse_quantile_optimization.sql
+++ b/tests/queries/0_stateless/01956_fuse_quantile_optimization.sql
@@ -71,3 +71,6 @@ SELECT quantileTimingWeighted([[[[['-214748364.8'], NULL]], [[[quantileTimingWei
 SELECT quantileTimingWeighted([quantileTimingWeighted(0.5)(1, 1)])(1, 1); -- { serverError ILLEGAL_AGGREGATION }
 
 DROP TABLE datetime;
+
+SET optimize_syntax_fuse_functions = 1;
+SELECT quantile(1 AS a), quantile(a AS b), quantile(b AS c);