diff --git a/regress/expected/expr.out b/regress/expected/expr.out
index 806a6f65c..7b2afa2eb 100644
--- a/regress/expected/expr.out
+++ b/regress/expected/expr.out
@@ -10708,6 +10708,30 @@ NOTICE:  graph "issue_2391" has been dropped
  
 (1 row)
 
+--
+-- Issue 2563: age_to*list called from SQL with a non-agtype literal
+-- must raise an error instead of crashing
+--
+SELECT ag_catalog.age_tobooleanlist('[true]');
+ERROR:  toBooleanList() argument must be of type agtype
+SELECT ag_catalog.age_tofloatlist('[1.5]');
+ERROR:  toFloatList() argument must be of type agtype
+SELECT ag_catalog.age_tointegerlist('[1]');
+ERROR:  toIntegerList() argument must be of type agtype
+SELECT ag_catalog.age_tostringlist('[1]');
+ERROR:  toStringList() argument must be of type agtype
+SELECT ag_catalog.age_tobooleanlist('[true]'::agtype);
+ age_tobooleanlist 
+-------------------
+ [true]
+(1 row)
+
+SELECT ag_catalog.age_tostringlist('[1]'::agtype);
+ age_tostringlist 
+------------------
+ ["1"]
+(1 row)
+
 --
 -- End of tests
 --
diff --git a/regress/sql/expr.sql b/regress/sql/expr.sql
index d4d900a1c..71a944ddc 100644
--- a/regress/sql/expr.sql
+++ b/regress/sql/expr.sql
@@ -4200,6 +4200,17 @@ SELECT * FROM cypher('issue_2391', $$
 $$) AS (n agtype);
 SELECT * FROM drop_graph('issue_2391', true);
 
+--
+-- Issue 2563: age_to*list called from SQL with a non-agtype literal
+-- must raise an error instead of crashing
+--
+SELECT ag_catalog.age_tobooleanlist('[true]');
+SELECT ag_catalog.age_tofloatlist('[1.5]');
+SELECT ag_catalog.age_tointegerlist('[1]');
+SELECT ag_catalog.age_tostringlist('[1]');
+SELECT ag_catalog.age_tobooleanlist('[true]'::agtype);
+SELECT ag_catalog.age_tostringlist('[1]'::agtype);
+
 --
 -- End of tests
 --
diff --git a/src/backend/utils/adt/agtype.c b/src/backend/utils/adt/agtype.c
index cc9cc7717..84e0f36d2 100644
--- a/src/backend/utils/adt/agtype.c
+++ b/src/backend/utils/adt/agtype.c
@@ -6864,6 +6864,11 @@ Datum age_tobooleanlist(PG_FUNCTION_ARGS)
     if (PG_ARGISNULL(0))
         PG_RETURN_NULL();
 
+    /* the argument must be agtype, otherwise it cannot be read as one */
+    if (get_fn_expr_argtype(fcinfo->flinfo, 0) != AGTYPEOID)
+        ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+                        errmsg("toBooleanList() argument must be of type agtype")));
+
     agt_arg = AG_GET_ARG_AGTYPE_P(0);
     /* check for an array */
     if (!AGT_ROOT_IS_ARRAY(agt_arg) || AGT_ROOT_IS_SCALAR(agt_arg))
@@ -7105,6 +7110,11 @@ Datum age_tofloatlist(PG_FUNCTION_ARGS)
     {
         PG_RETURN_NULL();
     }
+    /* the argument must be agtype, otherwise it cannot be read as one */
+    if (get_fn_expr_argtype(fcinfo->flinfo, 0) != AGTYPEOID)
+        ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+                        errmsg("toFloatList() argument must be of type agtype")));
+
     agt_arg = AG_GET_ARG_AGTYPE_P(0);
 
     /* check for an array */
@@ -7462,6 +7472,11 @@ Datum age_tointegerlist(PG_FUNCTION_ARGS)
     {
         PG_RETURN_NULL();
     }
+    /* the argument must be agtype, otherwise it cannot be read as one */
+    if (get_fn_expr_argtype(fcinfo->flinfo, 0) != AGTYPEOID)
+        ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+                        errmsg("toIntegerList() argument must be of type agtype")));
+
     agt_arg = AG_GET_ARG_AGTYPE_P(0);
     /* check for an array */
     if (!AGT_ROOT_IS_ARRAY(agt_arg) || AGT_ROOT_IS_SCALAR(agt_arg))
@@ -8102,6 +8117,11 @@ Datum age_tostringlist(PG_FUNCTION_ARGS)
     {
         PG_RETURN_NULL();
     }
+    /* the argument must be agtype, otherwise it cannot be read as one */
+    if (get_fn_expr_argtype(fcinfo->flinfo, 0) != AGTYPEOID)
+        ereport(ERROR, (errcode(ERRCODE_INVALID_PARAMETER_VALUE),
+                        errmsg("toStringList() argument must be of type agtype")));
+
     agt_arg = AG_GET_ARG_AGTYPE_P(0);
     /* check for an array */
     if (!AGT_ROOT_IS_ARRAY(agt_arg) || AGT_ROOT_IS_SCALAR(agt_arg))