how to skip the iteration giving Unable to reduce the step size without violating a minimum step size

Error using Get_Functions_details>PID (line 68)

Unable to reduce the step size without violating a minimum step size of

3.37507799486057E-14 at time 9.5000000000002984 for model 'power_PSS16'

Error in PSO (line 72)

fitness=fobj(pos(i,:));

Error in MainPSO (line 58)

[Best_score4,Best_pos4,PSO_cg_curve] =

PSO(SearchAgents_no,Max_iteration,lb,ub,dim,fobj);