diff --git a/enginetest/queries/queries.go b/enginetest/queries/queries.go
index b71dbe3ff2..99ed2f3f9f 100644
--- a/enginetest/queries/queries.go
+++ b/enginetest/queries/queries.go
@@ -8688,6 +8688,15 @@ from typestable`,
 			{"k", "k", 1, 1, 0},
 		},
 	},
+	{
+		Query: "select * from xy inner join uv on (xy.x in (false in ('asdf')));",
+		Expected: []sql.Row{
+			{1, 0, 0, 1},
+			{1, 0, 1, 1},
+			{1, 0, 2, 2},
+			{1, 0, 3, 2},
+		},
+	},
 }
 
 var KeylessQueries = []QueryTest{
diff --git a/sql/expression/in.go b/sql/expression/in.go
index 193761e1ec..bf9fe73651 100644
--- a/sql/expression/in.go
+++ b/sql/expression/in.go
@@ -336,7 +336,11 @@ func convertOrTruncate(ctx *sql.Context, i interface{}, t sql.Type) (interface{}
 		Message: fmt.Sprintf("Truncated incorrect %s value: %v", t.String(), i),
 		Code:    1292,
 	}
-	ctx.Session.Warn(&warning)
+
+	if ctx != nil && ctx.Session != nil {
+		ctx.Session.Warn(&warning)
+	}
+
 	return t.Zero(), nil
 }