diff --git a/pom.xml b/pom.xml
index 81fbe60..16211a9 100644
--- a/pom.xml
+++ b/pom.xml
@@ -4,7 +4,7 @@
 	<modelVersion>4.0.0</modelVersion>
 	<groupId>de.srsoftware</groupId>
 	<artifactId>web4rail</artifactId>
-	<version>0.11.25</version>
+	<version>0.11.26</version>
 	<name>Web4Rail</name>
 	<packaging>jar</packaging>
 	<description>Java Model Railway Control</description>
diff --git a/src/main/java/de/srsoftware/web4rail/Range.java b/src/main/java/de/srsoftware/web4rail/Range.java
index ac49bf1..2b37776 100644
--- a/src/main/java/de/srsoftware/web4rail/Range.java
+++ b/src/main/java/de/srsoftware/web4rail/Range.java
@@ -33,4 +33,12 @@ public class Range extends BaseClass{
 	public String toString() {
 		return min+"…"+max;
 	}
+
+	public void validate() {
+		if (min>max) {
+			int dummy = min;
+			min = max;
+			max = dummy;
+		}
+	}
 }
diff --git a/src/main/java/de/srsoftware/web4rail/tiles/Block.java b/src/main/java/de/srsoftware/web4rail/tiles/Block.java
index ef30653..94d052b 100644
--- a/src/main/java/de/srsoftware/web4rail/tiles/Block.java
+++ b/src/main/java/de/srsoftware/web4rail/tiles/Block.java
@@ -93,13 +93,11 @@ public abstract class Block extends StretchableTile implements Comparable<Block>
 
 		public WaitTime setMax(Direction dir,int max) {
 			get(dir).max = max;
-			if (get(dir).min > max) setMin(dir,max);
 			return this;
 		}
 
 		public WaitTime setMin(Direction dir,int min) {
 			get(dir).min = min;
-			if (get(dir).max > min) setMax(dir,min);
 			return this;
 		}
 		
@@ -112,6 +110,11 @@ public abstract class Block extends StretchableTile implements Comparable<Block>
 		public String toString() {
 			return "WaitTime("+tag+", "+dirs+")";
 		}
+
+		public void validate() {
+			for (Entry<Direction, Range> entry: dirs.entrySet()) entry.getValue().validate();
+			
+		}
 	}
 
 	
@@ -376,6 +379,7 @@ public abstract class Block extends StretchableTile implements Comparable<Block>
 				} else wt.setMax(dir, Integer.parseInt(val));
 			}			
 		}
+		for (WaitTime wt: waitTimes) wt.validate();
 				
 		return this;
 	}