Invalid CellReference:1A

Hi All , 

We are receiving an excel file (.xlsx) from Client , for reading and processing .
We are using below apache.poi dependency , latest version. 
<dependency>
    <groupId>org.apache.poi</groupId>
    <artifactId>poi</artifactId>
    <version>5.0.0</version>
</dependency>

While reading the file in java  , getting below issue . 

java.lang.IllegalArgumentException: Invalid CellReference:1A
at org.apache.poi.ss.util.CellReference.seperateRefParts

On further analysis  , we found that if we open the file and just do simple save (Ctrl+S ) without modifying anything ,it works and able to read and process the rows  in a code. 
Else we face above issue . 

Could you please suggest , what needs to be done ? 
 
Thanks