diff --git a/vendor/plugins/rfpdf/lib/fpdf/chinese.rb b/vendor/plugins/rfpdf/lib/fpdf/chinese.rb
index 94f8ee49d..dca53c556 100644
--- a/vendor/plugins/rfpdf/lib/fpdf/chinese.rb
+++ b/vendor/plugins/rfpdf/lib/fpdf/chinese.rb
@@ -130,7 +130,7 @@ module PDF_Chinese
   	nb=s.length
   	i=0
   	while(i<nb)
-  		c=s[i]
+  		c = s[i].is_a?(String) ? s[i].ord : s[i]
   		if(c<128)
   			l+=cw[c.chr] if cw[c.chr]
   			i+=1
@@ -182,7 +182,7 @@ module PDF_Chinese
   	nl=1
   	while(i<nb)
   		#Get next character
-  		c=s[i]
+  		c = s[i].is_a?(String) ? s[i].ord : s[i]
   		#Check if ASCII or MB
   		ascii=(c<128)
   		if(c.chr=="\n")
@@ -258,7 +258,7 @@ module PDF_Chinese
   	nl=1
   	while(i<nb)
   		#Get next character
-  		c=s[i]
+  		c = s[i].is_a?(String) ? s[i].ord : s[i]
   		#Check if ASCII or MB
   		ascii=(c<128)
   		if(c.chr=="\n")
diff --git a/vendor/plugins/rfpdf/lib/fpdf/japanese.rb b/vendor/plugins/rfpdf/lib/fpdf/japanese.rb
index 93bc283cc..78f6ce932 100644
--- a/vendor/plugins/rfpdf/lib/fpdf/japanese.rb
+++ b/vendor/plugins/rfpdf/lib/fpdf/japanese.rb
@@ -100,7 +100,7 @@ module PDF_Japanese
   	nb=s.length
   	i=0
   	while(i<nb)
-  		o=s[i]
+  		o = s[i].is_a?(String) ? s[i].ord : s[i]
   		if(o<128)
   			#ASCII
   			l+=cw[o.chr] if cw[o.chr]
@@ -158,7 +158,7 @@ module PDF_Japanese
   	nl=1
   	while(i<nb)
   		#Get next character
-  		c=s[i]
+  		c = s[i].is_a?(String) ? s[i].ord : s[i]
   		o=c #o=ord(c)
   		if(o==10)
   			#Explicit line break
@@ -246,7 +246,7 @@ module PDF_Japanese
   	nl=1
   	while(i<nb)
   		#Get next character
-  		c=s[i]
+  		c = s[i].is_a?(String) ? s[i].ord : s[i]
   		o=c
   		if(o==10)
   			#Explicit line break
diff --git a/vendor/plugins/rfpdf/lib/fpdf/korean.rb b/vendor/plugins/rfpdf/lib/fpdf/korean.rb
index 0d4ee3f6e..1777ab09a 100644
--- a/vendor/plugins/rfpdf/lib/fpdf/korean.rb
+++ b/vendor/plugins/rfpdf/lib/fpdf/korean.rb
@@ -99,7 +99,7 @@ UHC_widths={' ' => 333, '!' => 416, '"' => 416, '#' => 833, '$' => 625, '%' => 9
   	nb=s.length
   	i=0
   	while(i<nb)
-  		c=s[i]
+  		c = s[i].is_a?(String) ? s[i].ord : s[i]
   		if(c<128)
   			l+=cw[c.chr] if cw[c.chr]
   			i+=1
@@ -151,7 +151,7 @@ UHC_widths={' ' => 333, '!' => 416, '"' => 416, '#' => 833, '$' => 625, '%' => 9
   	nl=1
   	while(i<nb)
   		#Get next character
-  		c=s[i]
+  		c = s[i].is_a?(String) ? s[i].ord : s[i]
   		#Check if ASCII or MB
   		ascii=(c<128)
   		if(c.chr=="\n")
@@ -227,7 +227,7 @@ UHC_widths={' ' => 333, '!' => 416, '"' => 416, '#' => 833, '$' => 625, '%' => 9
   	nl=1
   	while(i<nb)
   		#Get next character
-  		c=s[i]
+  		c = s[i].is_a?(String) ? s[i].ord : s[i]
   		#Check if ASCII or MB
   		ascii=(c<128)
   		if(c.chr=="\n")