Error when accessing an internal table

What causes this issue?

During processing of trading contract &V1&, an error occurred when
internal table &V2& was accessed.

System Response

INCLUDE ISR_STOP

How to fix this error?

INCLUDE ISR_VERWALTUNG

Procedure for System Administrators

An internal error occurred in function module &V4&. Internal table &V2&
was accessed with the following value: &V3&.

Error message extract from SAP system. Copyright SAP SE.