Hi @armingrudd how are you? I hope well. I send you another question if you can answer me pls: when i set a Variable Value with “Table Column to Variable node” and the Variable Value could be unknown in same case, how i can bypass “unknown error message” of the Variable? in this case in photo attached “Variable Row20”. thankx for help me [image] @umberto75 in CC:

Hi everyone, I found the solution to my need! I “doped” the variables, joining them with the “Catch Error Var Ports” node so that those which are unknown have the “X” character as their interceptor in this case: [image] I share it to caring. Thank u @armingrudd out put Variables KNOW and UNKNOW [image] thanks we to collaboration: @armingrudd , @ActionAndi , @MartinDDDD , @umberto75 and @Iris for the shared post inspired me [image] try-catch - why is the variable missing outside? KNIME Analytics Platform Variables created inside a try catch will stay in this space. In your lower example you did connect the String configuration to the catch node. This will forward the variable, but you cannot decide in the try catch which which variables are generated and which not. However variables created before the try node can be changed inside the try catch. If you change your workflow as below, you will see that the variable nodes work similarly to the table nodes. [image]

Problem Variable

KNIME Analytics Platform

MartinDDDD February 24, 2025, 8:04am 5

So it is not testing if a specific flow variable has a “missing value”, but to test if a variable “Row20” exists?

Maybe take a look at this solution:

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