diff --git a/src/main/java/eu/omp/irap/vespa/epntapclient/utils/Queries.java b/src/main/java/eu/omp/irap/vespa/epntapclient/utils/Queries.java
index 0e28293..d79027c 100644
--- a/src/main/java/eu/omp/irap/vespa/epntapclient/utils/Queries.java
+++ b/src/main/java/eu/omp/irap/vespa/epntapclient/utils/Queries.java
@@ -50,14 +50,12 @@ public final class Queries {
 	public static String getQuery(String tableName, Map<String, Object> params, int nbRow) {
 		StringJoiner join = new StringJoiner(" AND ");
 		for (Map.Entry<String, Object> param : params.entrySet()) {
-			if (param.getValue() != null) {
-				Class paramClass = param.getValue().getClass();
+			Class paramClass = param.getValue().getClass();
 
-				if (paramClass == String.class && !"".equals(param.getValue())) {
-					join.add(param.getKey() + " LIKE '%" + param.getValue() + "%'");
-				} else if (paramClass == Float.class || paramClass == Integer.class) {
-					join.add(param.getKey() + " = " + param.getValue().toString());
-				}
+			if (paramClass == String.class && !"".equals(param.getValue())) {
+				join.add(param.getKey() + " LIKE '%" + param.getValue() + "%'");
+			} else {
+				join.add(param.getKey() + " = " + param.getValue().toString());
 			}
 		}
 		String where = "".equals(join.toString()) ? "" : " WHERE " + join.toString();
diff --git a/src/main/java/eu/omp/irap/vespa/epntapclient/view/RequestView.java b/src/main/java/eu/omp/irap/vespa/epntapclient/view/RequestView.java
index 0913d1c..28eaf6f 100644
--- a/src/main/java/eu/omp/irap/vespa/epntapclient/view/RequestView.java
+++ b/src/main/java/eu/omp/irap/vespa/epntapclient/view/RequestView.java
@@ -131,8 +131,13 @@ public class RequestView extends JPanel implements ActionListener {
 	}
 
 	public void updateParam(String paramName, Object value) {
-		logger.info("uploading " + paramName + ": " + value);
-		paramValues.put(paramName, value);
+		if (value == null) {
+			paramValues.remove(paramName);
+			logger.info("removed " + paramName);
+		} else {
+			paramValues.put(paramName, value);
+			logger.info("uploaded " + paramName + ": " + value);
+		}
 		updateQueryArea();
 	}
 
--
libgit2 0.21.2