TOPSAR-Merge error during S1A/S1B interferogram: java.lang.NullPointerException

Did you try out this

co reg…(the out put should be deramp and dmod)…> s-1 range shift
…> s-1 azimuth shift…>deburst…>subset…>infgram
formation …> Topographic removal …>Filtering Goldstein …>
Unwrapping

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