diff --git a/Logic/Tags/And.ts b/Logic/Tags/And.ts
index 426e2addc..fa79d3eda 100644
--- a/Logic/Tags/And.ts
+++ b/Logic/Tags/And.ts
@@ -238,4 +238,8 @@ export class And extends TagsFilter {
         
         return new And(newAnds)
     }
+    
+    isNegative(): boolean {
+        return !this.and.some(t => !t.isNegative());
+    }
 }
\ No newline at end of file
diff --git a/Logic/Tags/ComparingTag.ts b/Logic/Tags/ComparingTag.ts
index 20d5ffbde..6b790311b 100644
--- a/Logic/Tags/ComparingTag.ts
+++ b/Logic/Tags/ComparingTag.ts
@@ -59,4 +59,8 @@ export default class ComparingTag implements TagsFilter {
     optimize(): TagsFilter | boolean {
         return this;
     }
+    
+    isNegative(): boolean {
+        return true;
+    }
 }
\ No newline at end of file
diff --git a/Logic/Tags/Or.ts b/Logic/Tags/Or.ts
index 2ff799178..07f50629b 100644
--- a/Logic/Tags/Or.ts
+++ b/Logic/Tags/Or.ts
@@ -167,6 +167,10 @@ export class Or extends TagsFilter {
 
         return new Or(newOrs)
     }
+    
+    isNegative(): boolean {
+        return this.or.some(t => t.isNegative());
+    }
 }
 
 
diff --git a/Logic/Tags/RegexTag.ts b/Logic/Tags/RegexTag.ts
index b3a48b6a1..8a4c7ad3b 100644
--- a/Logic/Tags/RegexTag.ts
+++ b/Logic/Tags/RegexTag.ts
@@ -197,4 +197,8 @@ export class RegexTag extends TagsFilter {
     optimize(): TagsFilter | boolean {
         return this;
     }
+    
+    isNegative(): boolean {
+        return this.invert;
+    }
 }
\ No newline at end of file
diff --git a/Logic/Tags/SubstitutingTag.ts b/Logic/Tags/SubstitutingTag.ts
index 41b114ec3..532c2586e 100644
--- a/Logic/Tags/SubstitutingTag.ts
+++ b/Logic/Tags/SubstitutingTag.ts
@@ -89,4 +89,8 @@ export default class SubstitutingTag implements TagsFilter {
     optimize(): TagsFilter | boolean {
         return this;
     }
+    
+    isNegative(): boolean {
+        return false;
+    }
 }
\ No newline at end of file
diff --git a/Logic/Tags/Tag.ts b/Logic/Tags/Tag.ts
index 9bc1b1eba..9a4919688 100644
--- a/Logic/Tags/Tag.ts
+++ b/Logic/Tags/Tag.ts
@@ -120,4 +120,8 @@ export class Tag extends TagsFilter {
     optimize(): TagsFilter | boolean {
         return this;
     }
+    
+    isNegative(): boolean {
+        return false;
+    }
 }
\ No newline at end of file
diff --git a/Logic/Tags/TagUtils.ts b/Logic/Tags/TagUtils.ts
index cd4a90f85..d72008136 100644
--- a/Logic/Tags/TagUtils.ts
+++ b/Logic/Tags/TagUtils.ts
@@ -172,7 +172,7 @@ export class TagUtils {
      * 
      * TagUtils.Tag("key=value") // => new Tag("key", "value")
      * TagUtils.Tag("key=") // => new Tag("key", "")
-     * TagUtils.Tag("key!=") // => new RegexTag("key", "^..*$", true)
+     * TagUtils.Tag("key!=") // => new RegexTag("key", "^..*$")
      * TagUtils.Tag("key!=value") // => new RegexTag("key", /^value$/, true)
      * TagUtils.Tag("vending~.*bicycle_tube.*") // => new RegexTag("vending", /^.*bicycle_tube.*$/)
      * TagUtils.Tag("x!~y") // => new RegexTag("x", /^y$/, true)
@@ -298,6 +298,7 @@ export class TagUtils {
             }
             if (split[1] === "") {
                 split[1] = "..*"
+                return new RegexTag(split[0], /^..*$/)
             }
             return new RegexTag(
                 split[0],
diff --git a/Logic/Tags/TagsFilter.ts b/Logic/Tags/TagsFilter.ts
index 5a9270953..c505fe117 100644
--- a/Logic/Tags/TagsFilter.ts
+++ b/Logic/Tags/TagsFilter.ts
@@ -33,5 +33,21 @@ export abstract class TagsFilter {
      */
     abstract optimize(): TagsFilter | boolean;
 
-
+    /**
+     * Returns 'true' if the tagsfilter might select all features (i.e. the filter will return everything from OSM, except a few entries).
+     * 
+     * A typical negative tagsfilter is 'key!=value'
+     * 
+     * import {RegexTag} from "./RegexTag";
+     * import {Tag} from "./Tag";
+     * import {And} from "./And";
+     * import {Or} from "./Or";  
+     * 
+     * new Tag("key","value").isNegative() // => false
+     * new And([new RegexTag("key","value", true)]).isNegative() // => true
+     * new Or([new RegexTag("key","value", true), new Tag("x","y")]).isNegative() // => true
+     * new And([new RegexTag("key","value", true), new Tag("x","y")]).isNegative() // => false
+     */
+    abstract isNegative(): boolean
+    
 }
\ No newline at end of file
diff --git a/Models/Constants.ts b/Models/Constants.ts
index 7f6124ad3..cd587284f 100644
--- a/Models/Constants.ts
+++ b/Models/Constants.ts
@@ -2,7 +2,7 @@ import {Utils} from "../Utils";
 
 export default class Constants {
 
-    public static vNumber = "0.17.0";
+    public static vNumber = "0.17.1";
     
     public static ImgurApiKey = '7070e7167f0a25a'
     public static readonly mapillary_client_token_v4 = "MLY|4441509239301885|b40ad2d3ea105435bd40c7e76993ae85"
diff --git a/Models/ThemeConfig/LayerConfig.ts b/Models/ThemeConfig/LayerConfig.ts
index 405cf59be..94d663096 100644
--- a/Models/ThemeConfig/LayerConfig.ts
+++ b/Models/ThemeConfig/LayerConfig.ts
@@ -101,6 +101,10 @@ export default class LayerConfig extends WithContextLoader {
             context + "source.osmTags"
         );
 
+        if(Constants.priviliged_layers.indexOf(this.id) < 0 && osmTags.isNegative()){
+            throw context + "The source states tags which give a very wide selection: it only uses negative expressions, which will result in too much and unexpected data. Add at least one required tag. The tags are:\n\t"+osmTags.asHumanString(false, false, {});
+        }
+        
         if (json.source["geoJsonSource"] !== undefined) {
             throw context + "Use 'geoJson' instead of 'geoJsonSource'";
         }
@@ -108,6 +112,7 @@ export default class LayerConfig extends WithContextLoader {
         if (json.source["geojson"] !== undefined) {
             throw context + "Use 'geoJson' instead of 'geojson' (the J is a capital letter)";
         }
+        
 
         this.source = new SourceConfig(
             {