diff --git a/SpineRuntimes/SpineRuntime21/Skeleton.cs b/SpineRuntimes/SpineRuntime21/Skeleton.cs
index 11d8763..4f47a24 100644
--- a/SpineRuntimes/SpineRuntime21/Skeleton.cs
+++ b/SpineRuntimes/SpineRuntime21/Skeleton.cs
@@ -338,7 +338,7 @@ namespace SpineRuntime21 {
 
                 if (vertices != null)
                 {
-                    for (int ii = 0; ii < verticesLength; ii += 2)
+                    for (int ii = 0; ii + 1 < verticesLength; ii += 2)
                     {
                         float vx = vertices[ii], vy = vertices[ii + 1];
                         minX = Math.Min(minX, vx);
diff --git a/SpineRuntimes/SpineRuntime34/Skeleton.cs b/SpineRuntimes/SpineRuntime34/Skeleton.cs
index 6cae9a4..64b891d 100644
--- a/SpineRuntimes/SpineRuntime34/Skeleton.cs
+++ b/SpineRuntimes/SpineRuntime34/Skeleton.cs
@@ -489,7 +489,7 @@ namespace SpineRuntime34 {
 
                 if (vertices != null)
                 {
-                    for (int ii = 0; ii < verticesLength; ii += 2)
+                    for (int ii = 0; ii + 1 < verticesLength; ii += 2)
                     {
                         float vx = vertices[ii], vy = vertices[ii + 1];
                         minX = Math.Min(minX, vx);
diff --git a/SpineRuntimes/SpineRuntime35/Skeleton.cs b/SpineRuntimes/SpineRuntime35/Skeleton.cs
index 284c315..d12e9b3 100644
--- a/SpineRuntimes/SpineRuntime35/Skeleton.cs
+++ b/SpineRuntimes/SpineRuntime35/Skeleton.cs
@@ -521,7 +521,7 @@ namespace SpineRuntime35 {
 				}
 
 				if (vertices != null) {
-					for (int ii = 0; ii < verticesLength; ii += 2) {
+					for (int ii = 0; ii + 1 < verticesLength; ii += 2) {
 						float vx = vertices[ii], vy = vertices[ii + 1];
 						minX = Math.Min(minX, vx);
 						minY = Math.Min(minY, vy);
diff --git a/SpineRuntimes/SpineRuntime36/Skeleton.cs b/SpineRuntimes/SpineRuntime36/Skeleton.cs
index 637f6c1..30a105c 100644
--- a/SpineRuntimes/SpineRuntime36/Skeleton.cs
+++ b/SpineRuntimes/SpineRuntime36/Skeleton.cs
@@ -528,7 +528,7 @@ namespace SpineRuntime36 {
 				}
 
 				if (vertices != null) {
-					for (int ii = 0; ii < verticesLength; ii += 2) {
+					for (int ii = 0; ii + 1 < verticesLength; ii += 2) {
 						float vx = vertices[ii], vy = vertices[ii + 1];
 						minX = Math.Min(minX, vx);
 						minY = Math.Min(minY, vy);
diff --git a/SpineRuntimes/SpineRuntime37/Skeleton.cs b/SpineRuntimes/SpineRuntime37/Skeleton.cs
index db7a403..b13a7dc 100644
--- a/SpineRuntimes/SpineRuntime37/Skeleton.cs
+++ b/SpineRuntimes/SpineRuntime37/Skeleton.cs
@@ -580,7 +580,7 @@ namespace SpineRuntime37 {
 				}
 
 				if (vertices != null) {
-					for (int ii = 0; ii < verticesLength; ii += 2) {
+					for (int ii = 0; ii + 1 < verticesLength; ii += 2) {
 						float vx = vertices[ii], vy = vertices[ii + 1];
 						minX = Math.Min(minX, vx);
 						minY = Math.Min(minY, vy);
diff --git a/SpineRuntimes/SpineRuntime38/Skeleton.cs b/SpineRuntimes/SpineRuntime38/Skeleton.cs
index 4b47340..46205fa 100644
--- a/SpineRuntimes/SpineRuntime38/Skeleton.cs
+++ b/SpineRuntimes/SpineRuntime38/Skeleton.cs
@@ -617,7 +617,7 @@ namespace SpineRuntime38 {
 				}
 
 				if (vertices != null) {
-					for (int ii = 0; ii < verticesLength; ii += 2) {
+					for (int ii = 0; ii + 1 < verticesLength; ii += 2) {
 						float vx = vertices[ii], vy = vertices[ii + 1];
 						minX = Math.Min(minX, vx);
 						minY = Math.Min(minY, vy);
diff --git a/SpineRuntimes/SpineRuntime40/Skeleton.cs b/SpineRuntimes/SpineRuntime40/Skeleton.cs
index 6036b8c..085b74d 100644
--- a/SpineRuntimes/SpineRuntime40/Skeleton.cs
+++ b/SpineRuntimes/SpineRuntime40/Skeleton.cs
@@ -595,7 +595,7 @@ namespace SpineRuntime40 {
 				}
 
 				if (vertices != null) {
-					for (int ii = 0; ii < verticesLength; ii += 2) {
+					for (int ii = 0; ii + 1 < verticesLength; ii += 2) {
 						float vx = vertices[ii], vy = vertices[ii + 1];
 						minX = Math.Min(minX, vx);
 						minY = Math.Min(minY, vy);
diff --git a/SpineRuntimes/SpineRuntime41/Skeleton.cs b/SpineRuntimes/SpineRuntime41/Skeleton.cs
index 93f0f7e..4d11257 100644
--- a/SpineRuntimes/SpineRuntime41/Skeleton.cs
+++ b/SpineRuntimes/SpineRuntime41/Skeleton.cs
@@ -641,7 +641,7 @@ namespace SpineRuntime41 {
 				}
 
 				if (vertices != null) {
-					for (int ii = 0; ii < verticesLength; ii += 2) {
+					for (int ii = 0; ii + 1 < verticesLength; ii += 2) {
 						float vx = vertices[ii], vy = vertices[ii + 1];
 						minX = Math.Min(minX, vx);
 						minY = Math.Min(minY, vy);
diff --git a/SpineRuntimes/SpineRuntime42/Skeleton.cs b/SpineRuntimes/SpineRuntime42/Skeleton.cs
index cfd1312..c1f6ff8 100644
--- a/SpineRuntimes/SpineRuntime42/Skeleton.cs
+++ b/SpineRuntimes/SpineRuntime42/Skeleton.cs
@@ -742,7 +742,7 @@ namespace SpineRuntime42 {
 						verticesLength = clipper.ClippedVertices.Count;
 					}
 
-					for (int ii = 0; ii < verticesLength; ii += 2) {
+					for (int ii = 0; ii + 1 < verticesLength; ii += 2) {
 						float vx = vertices[ii], vy = vertices[ii + 1];
 						minX = Math.Min(minX, vx);
 						minY = Math.Min(minY, vy);