fixes #206

Author: springdoc

springdoc-openapi-common/src/main/java/org/springdoc/core/OperationBuilder.java

@@ -207,7 +207,8 @@ private boolean existOperationId(String operationId, OpenAPI openAPI) {
         if (openAPI.getPaths() == null || openAPI.getPaths().isEmpty()) {
             return false;
         }
-        for (PathItem path : openAPI.getPaths().values()) {
+        for (Iterator<PathItem> iterator = openAPI.getPaths().values().iterator(); iterator.hasNext();) {
+            PathItem path = iterator.next();
             Set<String> pathOperationIds = extractOperationIdFromPathItem(path);
             if (pathOperationIds.contains(operationId)) {
                 return true;