Currently, if you call MarketplaceService:PromptBundlePurchase() with the ID of a bundle that you cannot afford, then all MarketplaceService purchase methods will completely break.
When this happens, a warning will appear in the output and no purchase UI will appear. Any future attempts to call methods such as PromptPurchase, PromptBundlePurchase, PromptGamePassPurchase, etc. will also not show the purchase UI.
This happens 100% of the time for me with the ID of any bundle that I cannot afford.
This also only happens in-game, not in Studio.
This was reported twice before, but both reports are closed. [1] [2]
Also, this previously only happened in Studio. It no longer happens in Studio; now it happens in-game instead.
Repro
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Join any experience that you have edit access to.
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Open the developer console and go to the “Server” output.
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In the command line, run
game.MarketplaceService:PromptBundlePurchase(game.Players.YOUR_USERNAME, BUNDLE_ID)with the ID of a bundle that you cannot afford.
(As an example, the ID of Korblox Deathwalker (
17,000) is 192. If you want to use a bundle not created by Roblox, make sure that third party sales are enabled in the experience.) -
You should not be prompted to purchase anything. Go to the “Client” output and observe the warning.
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Any future attempts to call any
MarketplaceServicepurchase methods will not do anything.
17,000) is 
System information
OS: Windows 10
CPU: Intel(R) Core™ i7-6700 CPU @ 3.40GHz
Memory: 16 GB
GPU: NVIDIA GeForce GTX 1660 Ti
Expected behavior
PromptBundlePurchase should not break purchase prompts if you cannot afford a bundle.