diff --git a/code/portal_marker.js b/code/portal_marker.js
index 7f208078..c88f78f0 100644
--- a/code/portal_marker.js
+++ b/code/portal_marker.js
@@ -30,12 +30,9 @@ window.setMarkerStyle = function(marker, selected) {
 
   marker.setStyle(styleOptions);
 
-  // don't run highlighters if we only have placeholder data
-  if (marker.options.data.level !== undefined) {
-    // FIXME? it's inefficient to set the marker style (above), then do it again inside the highlighter
-    // the highlighter API would need to be changed for this to be improved though. will it be too slow?
-    highlightPortal(marker);
-  }
+  // FIXME? it's inefficient to set the marker style (above), then do it again inside the highlighter
+  // the highlighter API would need to be changed for this to be improved though. will it be too slow?
+  highlightPortal(marker);
 
   if (selected) {
     marker.setStyle ({color: COLOR_SELECTED_PORTAL});
diff --git a/plugins/portal-highlighter-forgotten.user.js b/plugins/portal-highlighter-forgotten.user.js
index 9fc2cc15..aaa1a150 100644
--- a/plugins/portal-highlighter-forgotten.user.js
+++ b/plugins/portal-highlighter-forgotten.user.js
@@ -27,19 +27,22 @@ window.plugin.portalHighlighterInactive = function() {};
 
 window.plugin.portalHighlighterInactive.highlight = function(data) {
 
-  var daysUnmodified = (new Date().getTime() - data.portal.options.timestamp) / (24*60*60*1000);
+  if (data.portal.options.timestamp > 0) {
 
-  if (daysUnmodified >= 7) {
+    var daysUnmodified = (new Date().getTime() - data.portal.options.timestamp) / (24*60*60*1000);
 
-    var fill_opacity = Math.min(1,((daysUnmodified-7)/24)*.85 + .15);
+    if (daysUnmodified >= 7) {
 
-    var blue = Math.max(0,Math.min(255,Math.round((daysUnmodified-31)/62*255)));
+      var fill_opacity = Math.min(1,((daysUnmodified-7)/24)*.85 + .15);
 
-    var colour = 'rgb(255,0,'+blue+')';
+      var blue = Math.max(0,Math.min(255,Math.round((daysUnmodified-31)/62*255)));
 
-    var params = {fillColor: colour, fillOpacity: fill_opacity};
+      var colour = 'rgb(255,0,'+blue+')';
 
-    data.portal.setStyle(params);
+      var params = {fillColor: colour, fillOpacity: fill_opacity};
+
+      data.portal.setStyle(params);
+    }
   }
 
 }
diff --git a/plugins/portal-highlighter-level-color.user.js b/plugins/portal-highlighter-level-color.user.js
index 9b8c173c..76572c3f 100644
--- a/plugins/portal-highlighter-level-color.user.js
+++ b/plugins/portal-highlighter-level-color.user.js
@@ -27,8 +27,10 @@ window.plugin.portalHighlighterPortalsLevelColor = function() {};
 
 window.plugin.portalHighlighterPortalsLevelColor.colorLevel = function(data) {
   var portal_level = data.portal.options.data.level;
-  var opacity = .6;
-  data.portal.setStyle({fillColor: COLORS_LVL[portal_level], fillOpacity: opacity});
+  if (portal_level !== undefined) {
+    var opacity = .6;
+    data.portal.setStyle({fillColor: COLORS_LVL[portal_level], fillOpacity: opacity});
+  }
 }
 
 var setup =  function() {
diff --git a/plugins/portal-highlighter-missing-resonators.user.js b/plugins/portal-highlighter-missing-resonators.user.js
index 2bbf49e7..c3959d4a 100644
--- a/plugins/portal-highlighter-missing-resonators.user.js
+++ b/plugins/portal-highlighter-missing-resonators.user.js
@@ -30,7 +30,7 @@ window.plugin.portalsMissingResonators.highlight = function(data) {
   if(data.portal.options.team != TEAM_NONE) {
     var res_count = data.portal.options.data.resCount;
 
-    if(res_count < 8) {
+    if(res_count !== undefined && res_count < 8) {
       var fill_opacity = ((8-res_count)/8)*.85 + .15;
       var color = 'red';
       var params = {fillColor: color, fillOpacity: fill_opacity};
diff --git a/plugins/portal-highlighter-needs-recharge.user.js b/plugins/portal-highlighter-needs-recharge.user.js
index 7f8a18b8..bdee1253 100644
--- a/plugins/portal-highlighter-needs-recharge.user.js
+++ b/plugins/portal-highlighter-needs-recharge.user.js
@@ -29,7 +29,7 @@ window.plugin.portalHighlighterNeedsRecharge.highlight = function(data) {
   var d = data.portal.options.data;
   var health = d.health;
 
-  if(data.portal.options.team != TEAM_NONE && health < 100) {
+  if(health !== undefined && data.portal.options.team != TEAM_NONE && health < 100) {
     var color,fill_opacity;
     if (health > 95) {
       color = 'yellow';
diff --git a/plugins/show-portal-weakness.user.js b/plugins/show-portal-weakness.user.js
index 68592038..494aff8e 100644
--- a/plugins/show-portal-weakness.user.js
+++ b/plugins/show-portal-weakness.user.js
@@ -27,7 +27,7 @@ window.plugin.portalWeakness = function() {};
 
 window.plugin.portalWeakness.highlightWeakness = function(data) {
 
-  if(data.portal.options.team != TEAM_NONE) {
+  if(data.portal.options.resCount !== undefined && data.portal.options.data.health !== undefined && data.portal.options.team != TEAM_NONE) {
     var res_count = data.portal.options.data.resCount;
     var portal_health = data.portal.options.data.health;