diff --git a/src/main.lua b/src/main.lua
index b579273..685e945 100644
--- a/src/main.lua
+++ b/src/main.lua
@@ -225,6 +225,9 @@ end
 ---@param pitchTypeIndex number | nil
 ---@param accuracy number The closer to 1.0, the better
 function Game:pitch(pitchFlyTimeMs, pitchTypeIndex, accuracy)
+    if pitchTypeIndex == nil then
+        return -- No throw!
+    end
     self.state.ball:markUncatchable()
     self.state.ball.heldBy = nil
     self.state.pitchIsOver = false