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pauseObservers/resumeObservers patch and restore store.endUpdate for every store, but some entries in Meteor.connection._stores (from queued method collection names) don’t have endUpdate. Restoring store.endUpdate = store._originalEnd when _originalEnd was undefined left endUpdate non-callable and triggered the error. Fix: Only patch/restore when the method exists: in pauseObservers, do it only if typeof store.endUpdate === 'function'; in resumeObservers, only if typeof store._originalEnd === 'function'. Stores without endUpdate are left unchanged so the TypeError no longer occurs.
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pauseObservers/resumeObservers patch and restore store.endUpdate for every store, but some entries in Meteor.connection._stores (from queued method collection names) don’t have endUpdate. Restoring store.endUpdate = store._originalEnd when _originalEnd was undefined left endUpdate non-callable and triggered the error.
Fix: Only patch/restore when the method exists: in pauseObservers, do it only if typeof store.endUpdate === 'function'; in resumeObservers, only if typeof store._originalEnd === 'function'. Stores without endUpdate are left unchanged so the TypeError no longer occurs.