diff --git a/src/servers/membrane-orientation/web-api.ts b/src/servers/membrane-orientation/web-api.ts
index ed2f8f15c..bbdc2d7c8 100644
--- a/src/servers/membrane-orientation/web-api.ts
+++ b/src/servers/membrane-orientation/web-api.ts
@@ -49,7 +49,8 @@ async function predictMembraneOrientation(req: express.Request, res: express.Res
     try {
         const ctx = { runtime: SyncRuntimeContext, assetManager };
 
-        const entryId = req.params.id;
+        // Make sure this is a string, taking the first element if it's an array (which can happen if the query parameter is repeated)
+        const entryId = Array.isArray(req.params.id) ? req.params.id[0] : req.params.id;
         const assemblyId = req.query.assemblyId as string ?? '1';
         const p = parseParams(req);
         ConsoleLogger.log('predictMembraneOrientation', `${entryId}-${assemblyId} with params: ${JSON.stringify(p)}`);
diff --git a/src/servers/model/server/api-web.ts b/src/servers/model/server/api-web.ts
index 5e0282713..32d639b19 100644
--- a/src/servers/model/server/api-web.ts
+++ b/src/servers/model/server/api-web.ts
@@ -54,7 +54,7 @@ export function createResultWriter(response: express.Response, params: ResultWri
 
 function mapQuery(app: express.Express, queryName: string, queryDefinition: QueryDefinition) {
     function createJob(queryParams: any, req: express.Request, res: express.Response) {
-        const entryId = req.params.id;
+        const entryId = (Array.isArray(req.params.id) ? req.params.id[0] : req.params.id) || '';
         const commonParams = normalizeRestCommonParams(req.query);
         const resultWriterParams = { encoding: commonParams.encoding!, download: !!commonParams.download, filename: commonParams.filename!, entryId, queryName };
         const jobId = JobManager.add({
@@ -93,7 +93,9 @@ function serveStatic(req: express.Request, res: express.Response) {
             : req.params.source;
 
     const id = req.params.id;
-    const [fn, format] = mapSourceAndIdToFilename(source, id);
+    const stringSource = (Array.isArray(source) ? source[0] : source) || '';
+    const stringId = (Array.isArray(id) ? id[0] : id) || '';
+    const [fn, format] = mapSourceAndIdToFilename(stringSource, stringId);
     const binary = format === 'bcif' || fn.indexOf('.bcif') > 0;
 
     if (!fn || !fs.existsSync(fn)) {
diff --git a/src/servers/plugin-state/index.ts b/src/servers/plugin-state/index.ts
index 78c52b996..489f95b9c 100644
--- a/src/servers/plugin-state/index.ts
+++ b/src/servers/plugin-state/index.ts
@@ -105,7 +105,7 @@ function mapPath(path: string) {
 }
 
 app.get(mapPath(`/get/:id`), (req, res) => {
-    const id: string = req.params.id || '';
+    const id = (Array.isArray(req.params.id) ? req.params.id[0] : req.params.id) || '';
     console.log('Reading', id);
     if (id.length === 0 || id.indexOf('.') >= 0 || id.indexOf('/') >= 0 || id.indexOf('\\') >= 0) {
         res.status(404);
diff --git a/src/servers/volume/server/web-api.ts b/src/servers/volume/server/web-api.ts
index 0b034bcc0..632ece5d6 100644
--- a/src/servers/volume/server/web-api.ts
+++ b/src/servers/volume/server/web-api.ts
@@ -183,7 +183,9 @@ async function queryBox(req: express.Request, res: express.Response, params: Dat
         return;
     }
 
-    const outputFilename = Api.getOutputFilename(req.params.source, req.params.id, params);
+    const stringSource = (Array.isArray(req.params.source) ? req.params.source[0] : req.params.source) || '';
+    const stringId = (Array.isArray(req.params.id) ? req.params.id[0] : req.params.id) || '';
+    const outputFilename = Api.getOutputFilename(stringSource, stringId, params);
     const response = wrapResponse(outputFilename, res);
 
     try {