diff --git a/package-lock.json b/package-lock.json
index ca6b46f50e41e33f7dbfe9cf475fc47e10482fb2..8208e4ed433d76eed898db295c7498ffcf2c6ee2 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -8436,12 +8436,14 @@
         "balanced-match": {
           "version": "1.0.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "brace-expansion": {
           "version": "1.1.11",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "balanced-match": "^1.0.0",
             "concat-map": "0.0.1"
@@ -8456,17 +8458,20 @@
         "code-point-at": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "concat-map": {
           "version": "0.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "console-control-strings": {
           "version": "1.1.0",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "core-util-is": {
           "version": "1.0.2",
@@ -8583,7 +8588,8 @@
         "inherits": {
           "version": "2.0.3",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "ini": {
           "version": "1.3.5",
@@ -8595,6 +8601,7 @@
           "version": "1.0.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "number-is-nan": "^1.0.0"
           }
@@ -8609,6 +8616,7 @@
           "version": "3.0.4",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "brace-expansion": "^1.1.7"
           }
@@ -8616,12 +8624,14 @@
         "minimist": {
           "version": "0.0.8",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "minipass": {
           "version": "2.3.5",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "safe-buffer": "^5.1.2",
             "yallist": "^3.0.0"
@@ -8640,6 +8650,7 @@
           "version": "0.5.1",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "minimist": "0.0.8"
           }
@@ -8720,7 +8731,8 @@
         "number-is-nan": {
           "version": "1.0.1",
           "bundled": true,
-          "dev": true
+          "dev": true,
+          "optional": true
         },
         "object-assign": {
           "version": "4.1.1",
@@ -8732,6 +8744,7 @@
           "version": "1.4.0",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "wrappy": "1"
           }
@@ -8853,6 +8866,7 @@
           "version": "1.0.2",
           "bundled": true,
           "dev": true,
+          "optional": true,
           "requires": {
             "code-point-at": "^1.0.0",
             "is-fullwidth-code-point": "^1.0.0",
diff --git a/src/server/sparql/SparqlQueriesPeople.js b/src/server/sparql/SparqlQueriesPeople.js
index 01d853a4b49551e89f3bc122cb8b3afdd56553c8..6e7e89f20cb877a50231e19fcd0101c5846bbdfd 100644
--- a/src/server/sparql/SparqlQueriesPeople.js
+++ b/src/server/sparql/SparqlQueriesPeople.js
@@ -6,11 +6,9 @@ export const personProperties = `
     }
     UNION
     {
-      ?id dct:source ?source__id .
-      OPTIONAL { ?source__id skos:prefLabel ?sourcePrefLabel_ }
-      OPTIONAL { ?id mmm-schema:data_provider_url ?dataProviderUrl_ }
-      BIND(COALESCE(STR(?sourcePrefLabel_), STR(?source__id)) AS ?source__prefLabel)
-      BIND(COALESCE(?dataProviderUrl_, ?id) AS ?source__dataProviderUrl)
+      ?id mmm-schema:data_provider_url ?source__id .
+      BIND(?source__id AS ?source__dataProviderUrl)
+      BIND(?source__id AS ?source__prefLabel)
     }
     UNION
     {