diff --git a/sharedPlugins/researchSync/index.js b/sharedPlugins/researchSync/index.js
index dbb563c0..d48f0565 100644
--- a/sharedPlugins/researchSync/index.js
+++ b/sharedPlugins/researchSync/index.js
@@ -154,11 +154,19 @@ class ResearchSync {
         for (let [name, research] of Object.entries(cluster_researches))
             research.progress = this.research[name].contribution
 
-        for (let slave_data of slaves_data)
-            for (let [name, research] of Object.entries(slave_data.meta.research))
-                if (cluster_researches[name]
-                    && !isNaN(cluster_researches[name].progress) && !isNaN(research.contribution))
+        for (let slave_data of slaves_data) {
+            for (let [name, research] of Object.entries(slave_data.meta.research)) {
+                if (!cluster_researches[name])
+                    continue
+                if (isNaN(cluster_researches[name].progress)
+                    || isNaN(research.contribution)
+                    || isNaN(research.level)
+                    || isNaN(cluster_researches[name].level))
+                    continue
+                if (cluster_researches[name].level === research.level)
                     cluster_researches[name].progress += research.contribution
+            }
+        }
 
         for (let [name, research] of Object.entries(cluster_researches)) {
             if (research.progress > 1) {