diff --git a/src/main/java/jadx/codegen/InsnGen.java b/src/main/java/jadx/codegen/InsnGen.java
index 729cf988a..71b077136 100644
--- a/src/main/java/jadx/codegen/InsnGen.java
+++ b/src/main/java/jadx/codegen/InsnGen.java
@@ -571,7 +571,7 @@ public class InsnGen {
 			code.add('(').add(v1).add(' ').add(op.getSymbol()).add(' ').add(v2).add(')');
 		} else {
 			String res = arg(insn.getResult());
-			if (res.equals(v1)) {
+			if (res.equals(v1) && insn.getResult().equals(insn.getArg(0))) {
 				state.add(InsnGenState.NO_RESULT);
 				// "++" or "--"
 				if (insn.getArg(1).isLiteral() && (op == ArithOp.ADD || op == ArithOp.SUB)) {
diff --git a/src/main/java/jadx/codegen/MethodGen.java b/src/main/java/jadx/codegen/MethodGen.java
index bea58c385..bc8cc4abe 100644
--- a/src/main/java/jadx/codegen/MethodGen.java
+++ b/src/main/java/jadx/codegen/MethodGen.java
@@ -194,7 +194,7 @@ public class MethodGen {
 		String r;
 		int i = 2;
 		do {
-			r = name + i;
+			r = name + "_" + i;
 			i++;
 		} while (varNames.contains(r));
 		varNames.add(r);
diff --git a/src/main/java/jadx/dex/visitors/DotGraphVisitor.java b/src/main/java/jadx/dex/visitors/DotGraphVisitor.java
index 8dccbbba7..8ef7f7baf 100644
--- a/src/main/java/jadx/dex/visitors/DotGraphVisitor.java
+++ b/src/main/java/jadx/dex/visitors/DotGraphVisitor.java
@@ -9,6 +9,7 @@ import jadx.dex.nodes.IRegion;
 import jadx.dex.nodes.InsnNode;
 import jadx.dex.nodes.MethodNode;
 import jadx.dex.trycatch.ExceptionHandler;
+import jadx.utils.BlockUtils;
 import jadx.utils.InsnUtils;
 import jadx.utils.Utils;
 
@@ -131,9 +132,11 @@ public class DotGraphVisitor extends AbstractVisitor {
 		for (BlockNode next : block.getDominatesOn())
 			conn.startLine(makeName(block) + " -> " + makeName(next) + "[style=dotted];");
 
-		// // add all dominators connections
-		// for (BlockNode next : BlockUtils.bitsetToBlocks(mth, block.getDoms()))
-		// conn.startLine(makeName(block) + " -> " + makeName(next) + "[style=dotted, color=green];");
+		// add all dominators connections
+		if (false) {
+			for (BlockNode next : BlockUtils.bitsetToBlocks(mth, block.getDoms()))
+				conn.startLine(makeName(block) + " -> " + makeName(next) + "[style=dotted, color=green];");
+		}
 	}
 
 	private String attributesString(IAttributeNode block) {
@@ -180,6 +183,7 @@ public class DotGraphVisitor extends AbstractVisitor {
 				.replace("{", "\\{").replace("}", "\\}")
 				.replace("\"", "\\\"")
 				.replace("-", "\\-")
+				.replace("|", "\\|")
 				.replace("\n", NL);
 	}
 }
diff --git a/src/main/java/jadx/dex/visitors/ModVisitor.java b/src/main/java/jadx/dex/visitors/ModVisitor.java
index 24560ceba..024134b9c 100644
--- a/src/main/java/jadx/dex/visitors/ModVisitor.java
+++ b/src/main/java/jadx/dex/visitors/ModVisitor.java
@@ -1,6 +1,7 @@
 package jadx.dex.visitors;
 
 import jadx.Consts;
+import jadx.deobf.NameMapper;
 import jadx.dex.attributes.AttributeType;
 import jadx.dex.info.MethodInfo;
 import jadx.dex.instructions.IndexInsnNode;
@@ -37,9 +38,10 @@ public class ModVisitor extends AbstractVisitor {
 			return;
 
 		removeStep(mth);
-
 		replaceStep(mth);
 
+		checkArgsNames(mth);
+
 		for (BlockNode block : mth.getBasicBlocks()) {
 			processExceptionHander(mth, block);
 		}
@@ -229,4 +231,14 @@ public class ModVisitor extends AbstractVisitor {
 		replaceInsn(block, pos, newInsn);
 		return true;
 	}
+
+	private void checkArgsNames(MethodNode mth) {
+		for(RegisterArg arg : mth.getArguments(false)) {
+			String name = arg.getTypedVar().getName();
+			if(name != null && NameMapper.isReserved(name)) {
+				name = name + "_" ;
+				arg.getTypedVar().setName(name);
+			}
+		}
+	}
 }