Did you use similar expression in your report: =Fields!Amount.Value/Fields!Number.Value? In this situation, if we have divide by zero, we may get NAN or Infinity in the report.
You can try to use the below expression to solve the issue:
=IIF(Fields!Number.Value=0,Nothing, Fields!Amount.Value/IIF(Fields!Number.Value=0,1, Fields!Number.Value))
If the issue is persist, please elaborate the issue for further investigation.
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