FitSuiteItem: fix

GUI/Model/Job/FitSuiteItem.cpp

@@ -45,7 +45,7 @@ FitParameterContainerItem* FitSuiteItem::fitParameterContainerItem()
 
 MinimizerContainerItem* FitSuiteItem::createMinimizerContainer()
 {
-    if (minimizerContainerItem())
+    if (getItem(T_MINIMIZER))
         throw Error("FitSuiteItem::createMinimizerContainer() -> Error. Attempt to create "
                     "a second MinimizerContainer.");