diff --git a/base/core/parser.js b/base/core/parser.js
index 06f3e3e..87d6f1b 100755
--- a/base/core/parser.js
+++ b/base/core/parser.js
@@ -230,6 +230,7 @@ var Parser = (function ParserClosure() {
         while (stream.pos < stream.end) {
           var scanBytes = stream.peekBytes(SCAN_BLOCK_SIZE);
           var scanLength = scanBytes.length - ENDSTREAM_SIGNATURE_LENGTH;
+          if (scanLength <= 0) break; // no match possible, end of stream or invalid stream
           var found = false, i, ii, j;
           for (i = 0, j = 0; i < scanLength; i++) {
             var b = scanBytes[i];
@@ -253,7 +254,7 @@ var Parser = (function ParserClosure() {
           stream.pos += scanLength;
         }
         if (!found) {
-          error('Missing endstream');
+          error('Missing endstream or invalid stream');
         }
         length = skipped;
 
diff --git a/base/display/canvas.js b/base/display/canvas.js
index fc87c14..43b2e42 100755
--- a/base/display/canvas.js
+++ b/base/display/canvas.js
@@ -902,8 +902,10 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
       this.current.font = fontObj;
       this.current.fontSize = size;
 
-      if (fontObj.coded)
-        return; // we don't need ctx.font for Type3 fonts
+	  if (fontObj.coded) {
+        warn('Unsupported Type3 font (custom Glyph) - ' + fontRefName);
+		return; // we don't need ctx.font for Type3 fonts
+	  }
 
       var name = fontObj.loadedName || 'sans-serif';
       var bold = fontObj.black ? (fontObj.bold ? 'bolder' : 'bold') :
@@ -1627,7 +1629,7 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
         //MQZ. make sure endGroup is always invoked after beginGroup
         if (this.groupLevel == 0)
             this.beginGroup(group);
-            
+
       this.groupLevel--;
       var groupCtx = this.ctx;
       this.ctx = this.groupStack.pop();
diff --git a/package.json b/package.json
index 60cf682..c4a4b38 100644
--- a/package.json
+++ b/package.json
@@ -37,7 +37,7 @@
 		"test:jest": "jest --config ./jest.config.json",
 		"test": "jest --config ./jest.config.json && npm run parse-r && npm run parse-fd",
 		"test:forms": "cd ./test && sh p2j.forms.sh",
-		"test:misc": "cd ./test && sh p2j.one.sh misc . \"Expected: 13 success, 5 fail exception with stack trace\" ",
+		"test:misc": "cd ./test && sh p2j.one.sh misc . \"Expected: 13 success, 6 exceptions with stack trace\" ",
 		"parse": "./bin/pdf2json.js -f ./test/pdf/fd/form/F1040.pdf -o ./test/target/fd/form",
 		"parse-s": "./bin/pdf2json.js -f ./test/pdf/fd/form/F1040.pdf -o ./test/target/fd/form -s",
 		"parse-t": "./bin/pdf2json.js -f ./test/pdf/fd/form/F1040.pdf -o ./test/target/fd/form -s -t",
@@ -48,7 +48,7 @@
 		"parse-tb": "./bin/pdf2json.js -f ./test/pdf/misc/i242_testingWithTable.pdf -o ./test/target/misc",
 		"parse-tc": "./bin/pdf2json.js -f ./test/pdf/misc/i293_pdfpac.pdf -o ./test/target/misc",
 		"parse-rectFix": "./bin/pdf2json.js -f ./test/pdf/misc/pr298_rect_fix_from_upstream.pdf -o ./test/target/misc",
-		"parse-e": "./bin/pdf2json.js -f ./test/pdf/misc/i373_err_broken.pdf -o ./test/target/misc",
+		"parse-e": "./bin/pdf2json.js -f ./test/pdf/misc/i306_err_invalid.pdf -o ./test/target/misc",
 		"build:rollup": "rollup -c ./rollup.config.js",
 		"build:bundle-pdfjs-base": "node rollup/bundle-pdfjs-base.js",
 		"build": "npm run build:bundle-pdfjs-base && npm run build:rollup",
diff --git a/test/pdf/misc/i306_err_invalid.pdf b/test/pdf/misc/i306_err_invalid.pdf
new file mode 100644
index 0000000..a79c66e
Binary files /dev/null and b/test/pdf/misc/i306_err_invalid.pdf differ