Simulink/Matlab throws a warning about log of a negative number durig simulation. The signal inspector shows the number is always positive.

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Simulink/Matlab throws the following warning while I try to linearize my model around an opperating point:
Warning: Log of a negative number in 'Model/Subsystem/Oxygenator/pHvirtual/Log'. Consider setting the 'Output
signal type' to complex.
The signal inspector shows the following values for the highlighted block:
The warning is thrown after I call the linearize function.
sys=linearize('Model',op1(2),io)
Running the model with simulink does not cause the warning.

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