A crack can weaken a pocket, especially when it supports bottles that move as the door opens. Remove the load from the damaged fitting rather than testing how much it still holds.
What the observation tells you
A small visible line does not reveal the remaining strength or whether a mounting tab is also affected. Tape or household glue may not restore structural support or suitability for food-storage conditions. A pocket that falls can damage other fittings or injure someone nearby.
A useful next step
Identify the exact model and the pocket position before sourcing a compatible replacement. Preserve photographs of the crack and attachment points without removing fixed components. Use the fridge only with its contents supported safely elsewhere.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.