Resolves: https://github.com/wso2/product-iots/issues/1302

components/device-mgt/org.wso2.carbon.device.mgt.ui/src/main/resources/jaggeryapps/devicemgt/app/units/cdmf.unit.geo-dashboard/public/assets/html_templates/modal/speed_alert.html

@@ -34,7 +34,7 @@
     <div class="row">
         <div class="col-lg-5 col-md-6 col-centered">
             <div class="input-group input-group-sm">
-                <input autofocus="enable" id="speedAlertValue" type="number" class="form-control" placeholder="Speed alert value " autocomplete="off">
+                <input autofocus="enable" id="speedAlertValue" type="number" min="0" class="form-control" placeholder="Speed alert value " autocomplete="off">
                 <span class="input-group-addon">km/h</span>
             </div>
             <br>