diff --git a/lib/node_modules/@stdlib/blas/base/dsyr/lib/ndarray.js b/lib/node_modules/@stdlib/blas/base/dsyr/lib/ndarray.js
index 490056e2b0e9..b45322084a3c 100644
--- a/lib/node_modules/@stdlib/blas/base/dsyr/lib/ndarray.js
+++ b/lib/node_modules/@stdlib/blas/base/dsyr/lib/ndarray.js
@@ -43,6 +43,8 @@ var base = require( './base.js' );
 * @throws {TypeError} first argument must specify whether to reference the lower or upper triangular matrix
 * @throws {RangeError} second argument must be a nonnegative integer
 * @throws {RangeError} fifth argument must be non-zero
+* @throws {RangeError} eighth argument must be non-zero
+* @throws {RangeError} ninth argument must be non-zero
 * @returns {Float64Array} `A`
 *
 * @example
@@ -64,6 +66,12 @@ function dsyr( uplo, N, alpha, x, strideX, offsetX, A, strideA1, strideA2, offse
 	if ( strideX === 0 ) {
 		throw new RangeError( format( 'invalid argument. Fifth argument must be non-zero. Value: `%d`.', strideX ) );
 	}
+	if ( strideA1 === 0 ) {
+		throw new RangeError( format( 'invalid argument. Eighth argument must be non-zero. Value: `%d`.', strideA1 ) );
+	}
+	if ( strideA2 === 0 ) {
+		throw new RangeError( format( 'invalid argument. Ninth argument must be non-zero. Value: `%d`.', strideA2 ) );
+	}
 	if ( N === 0 || alpha === 0.0 ) {
 		return A;
 	}
diff --git a/lib/node_modules/@stdlib/blas/base/dsyr/test/test.ndarray.js b/lib/node_modules/@stdlib/blas/base/dsyr/test/test.ndarray.js
index 81213d71812b..fb06e5cc56f2 100644
--- a/lib/node_modules/@stdlib/blas/base/dsyr/test/test.ndarray.js
+++ b/lib/node_modules/@stdlib/blas/base/dsyr/test/test.ndarray.js
@@ -139,6 +139,52 @@ tape( 'the function throws an error if provided an invalid fifth argument', func
 	}
 });
 
+tape( 'the function throws an error if provided an invalid eighth argument', function test( t ) {
+	var values;
+	var data;
+	var i;
+
+	data = ru;
+
+	values = [
+		0
+	];
+
+	for ( i = 0; i < values.length; i++ ) {
+		t.throws( badValue( values[ i ] ), RangeError, 'throws an error when provided ' + values[ i ] );
+	}
+	t.end();
+
+	function badValue( value ) {
+		return function badValue() {
+			dsyr( data.uplo, data.N, data.alpha, new Float64Array( data.x ), data.strideX, data.offsetX, new Float64Array( data.A ), value, data.strideA2, data.offsetA );
+		};
+	}
+});
+
+tape( 'the function throws an error if provided an invalid ninth argument', function test( t ) {
+	var values;
+	var data;
+	var i;
+
+	data = ru;
+
+	values = [
+		0
+	];
+
+	for ( i = 0; i < values.length; i++ ) {
+		t.throws( badValue( values[ i ] ), RangeError, 'throws an error when provided ' + values[ i ] );
+	}
+	t.end();
+
+	function badValue( value ) {
+		return function badValue() {
+			dsyr( data.uplo, data.N, data.alpha, new Float64Array( data.x ), data.strideX, data.offsetX, new Float64Array( data.A ), data.strideA1, value, data.offsetA );
+		};
+	}
+});
+
 tape( 'the function performs the symmetric rank 1 operation `A = α*x*x^T + A` (row-major, upper)', function test( t ) {
 	var expected;
 	var data;