diff --git a/src/logic/utils/gpa-utils.ts b/src/logic/utils/gpa-utils.ts
index 21b28b5..0950bbf 100644
--- a/src/logic/utils/gpa-utils.ts
+++ b/src/logic/utils/gpa-utils.ts
@@ -48,7 +48,7 @@ export class GPAUtils
             {
                 accurate = false;
             }
-            else if (course.level != 'none')
+            else if (course.level != 'none' && !isNaN(course.numericGrade))
             {
                 courses.push(course);
             }