diff --git a/freegs/control.py b/freegs/control.py
index eec00a8..dda3584 100644
--- a/freegs/control.py
+++ b/freegs/control.py
@@ -176,13 +176,14 @@ def max_total_currents(x):
             cons.append(con1)
 
         # Use the analytical current change as the initial guess
-        x0 = self.current_change
-        sol = optimize.minimize(
-            objective, x0, method="SLSQP", bounds=current_change_bnds, constraints=cons
-        )
-
-        self.current_change = sol.x
-        tokamak.controlAdjust(self.current_change)
+        if self.current_change.shape[0] > 0:
+            x0 = self.current_change
+            sol = optimize.minimize(
+                objective, x0, method="SLSQP", bounds=current_change_bnds, constraints=cons
+            )
+
+            self.current_change = sol.x
+            tokamak.controlAdjust(self.current_change)
 
         # Store info for user
         self.current_change = self.current_change