1 files changed, 1 insertions, 1 deletions
diff --git a/src/builtins.zig b/src/builtins.zig
index 5b1b4dcb..32e3cd84 100644
--- a/src/builtins.zig
+++ b/src/builtins.zig
@@ -1102,7 +1102,7 @@ pub const Joincol = struct {
 pub const Tutor = struct {
     pub const scope: Scope = .session;
     pub fn run(c: Ctx) void {
-        const free = c.p.freeSlot() orelse return;
+        const free = c.p.freeSlot() orelse return c.p.reportError(c.id, "Tutor", error.NoPaneSlots);
         _ = c.p.openTutorView(free) catch return;
         exec.placeNew(c.p, c.id, c.id, free, .doc); // a doc like any other
     }