diff --git a/src/NodaUncertaintyHelper.php b/src/NodaUncertaintyHelper.php
index 5045ebc..816e009 100644
--- a/src/NodaUncertaintyHelper.php
+++ b/src/NodaUncertaintyHelper.php
@@ -17,6 +17,8 @@ final class NodaUncertaintyHelper {
         "n.n.",
         "N.N.",
         "Künstler, unbekannt",
+        "Unbekannte Person",
+        "Unbekannter Maler",
         "ismeretlen",
         "Ismeretlen",
         "ismeretlen.",
@@ -248,7 +250,7 @@ final class NodaUncertaintyHelper {
 
         $value = self::trim($value);
 
-        if (\in_array($value, self::PERSINST_INDICATORS_DISALLOWED, true)) {
+        if (\in_array(trim($value, ";. "), self::PERSINST_INDICATORS_DISALLOWED, true)) {
             return "";
         }