ISERR function
ISERR returns TRUE if the value refers to any error value except #N/A. You can use this function to control error values in cells. If an error occurs, the function returns a logical or numeric value.
Syntax
ISERR(value)
value is any value or expression in which a test is performed to determine whether an error value that is not equal to #N/A is present.
Example
=ISERR(C5) returns FALSE.