diff --git a/SlevomatCodingStandard/Sniffs/ControlStructures/AssignmentInConditionSniff.php b/SlevomatCodingStandard/Sniffs/ControlStructures/AssignmentInConditionSniff.php
index 08877d347..56165449e 100644
--- a/SlevomatCodingStandard/Sniffs/ControlStructures/AssignmentInConditionSniff.php
+++ b/SlevomatCodingStandard/Sniffs/ControlStructures/AssignmentInConditionSniff.php
@@ -42,6 +42,7 @@ public function process(File $phpcsFile, $conditionStartPointer): void
 	{
 		$tokens = $phpcsFile->getTokens();
 		$token = $tokens[$conditionStartPointer];
+
 		if ($token['code'] === T_DO) {
 			$whilePointer = TokenHelper::findNext($phpcsFile, T_WHILE, $token['scope_closer'] + 1);
 			$whileToken = $tokens[$whilePointer];
@@ -53,6 +54,14 @@ public function process(File $phpcsFile, $conditionStartPointer): void
 			$parenthesisCloser = $token['parenthesis_closer'];
 			$type = $token['code'] === T_IF ? 'if' : 'elseif';
 		}
+
+		if (
+			$parenthesisOpener === null
+			|| $parenthesisCloser === null
+		) {
+			return;
+		}
+
 		$this->processCondition($phpcsFile, $parenthesisOpener, $parenthesisCloser, $type);
 	}
 
diff --git a/tests/Sniffs/ControlStructures/AssignmentInConditionSniffTest.php b/tests/Sniffs/ControlStructures/AssignmentInConditionSniffTest.php
index 1a37cb4a2..5aea3b7d6 100644
--- a/tests/Sniffs/ControlStructures/AssignmentInConditionSniffTest.php
+++ b/tests/Sniffs/ControlStructures/AssignmentInConditionSniffTest.php
@@ -49,4 +49,10 @@ public function testErrorsWithIgnoreAssignmentsInsideFunctionCalls(): void
 		}
 	}
 
+	public function testLiveCoding(): void
+	{
+		$resultFile = self::checkFile(__DIR__ . '/data/assignmentsInConditionsLiveCoding.php');
+		self::assertNoSniffErrorInFile($resultFile);
+	}
+
 }
diff --git a/tests/Sniffs/ControlStructures/data/assignmentsInConditionsLiveCoding.php b/tests/Sniffs/ControlStructures/data/assignmentsInConditionsLiveCoding.php
new file mode 100644
index 000000000..003dc8e5b
--- /dev/null
+++ b/tests/Sniffs/ControlStructures/data/assignmentsInConditionsLiveCoding.php
@@ -0,0 +1,5 @@
+<?php // lint >= 99.00
+
+// Live coding/parse error.
+// This must be the last test in the file.
+if ($a = 1